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Heavy Vehicle Travel Information System

Field Manual

May 2001 (revised)

CHAPTER 1:
INTRODUCTION

BACKGROUND

The data from the Heavy Vehicle Travel Information System (HVTIS) will be used to analyze the amount and nature of truck travel at the national and regional level. The information would be used by FHWA and other DOT administrations to evaluate changes in truck travel in order to assess impacts on the highway safety; the role of travel in economic productivity; impacts of changes in truck travel on infrastructure condition, and maintaining our mobility while protecting the human and natural environment. The increasing dependence on truck transport requires that data be available to better assess its overall contribution to the Nation's well-being. The data will allow transportation professionals at the Federal, state and metropolitan levels to make informed decisions about policies and plans.

The majority of States collect vehicle weight data periodically throughout the year using weigh-in-motion devices and also collect vehicle classification and/or total vehicle volume data continuously. To support the HVTIS data needs, the FHWA is requesting that the various State Highway Agencies provide monthly reporting of vehicle classification and/or total vehicle volume as well as annual reporting of weight data they collect as part of their existing traffic data collection programs.

Through its three stages of development, the HVTIS will provide increasingly detailed heavy vehicle data:

1. National estimates of heavy vehicle highway travel on a monthly basis.
2. National estimates of axle loadings and highway ton-miles of freight moved each month, and
3. Highway specific estimates of truck volumes and loadings

TRAFFIC DATA RECORDS

This section contains instructions for coding data in the formats requested by the FHWA. The record formats and coding instructions have been developed to provide input to the Heavy Vehicle Travel Information System. The HVTIS is supported by the Traffic Volume Trends (TVT) system and the Vehicle Travel Information System (VTRIS).

The TVT system is used to process the continuous traffic volume and vehicle classification data and produce a monthly Traffic Volume Trends report. The VTRIS is used to process the vehicle classification and truck weight data. Both are microcomputer database management systems that validate, summarize, and maintain traffic data. TVT and VTRIS may be used by anyone with data in the formats described in this section. They are available for downloading on the FHWA website from the Traffic Volume and Truck Weight page at www.fhwa.dot.gov/ohim/tvtw/../../policy/ohpi/travel/index.htm.

The data records are divided into four types: station description data, traffic volume data, vehicle classification data, and truck weight data. Each type of data has its own individualized record format. Specific coding instructions and record layouts are discussed separately for each type of data in the next chapters.

Note that some fields are labeled "critical." This means that a record cannot be processed by TVT or VTRIS without them. All data files described here are ASCII flat files. For character fields with missing or inapplicable data, enter blanks. Numbers such as counts should be right-justified and filled with leading blanks or zeros unless noted otherwise. For numeric fields with missing or inapplicable data, enter blanks or "-1" right-justified.

Certain data items are common to all four types of records. For example, all records contain a six-character station identification. This allows States to use a common identification system for all traffic monitoring stations.

Several fields in the station description record were replaced with fields that are needed to tie traffic data to geographic information systems (GIS). This will allow traffic data to be overlaid on the National Highway Planning Network (NHPN) and similar systems.

DATA SUBMITTALS TO THE FHWA

Copies of vehicle classification data collected by continuous automatic vehicle classifiers should be submitted monthly. In those States that also collect traffic volume data by permanent automatic traffic recorders, this data should also be submitted monthly. Both types of data should be submitted to FHWA within 20 days after the close of the month for which the data were collected. The station description record need only be sent annually or when there is a change. The preferred method of transmission is as an attachment to an e-mail message sent to atrdata@fhwa.dot.gov. Alternatively, diskettes may be mailed to:

Federal Highway Administration
Travel Monitoring and Surveys Division, HPPI-30
400 Seventh Street, SW
Washington, D.C. 20590
Attention: Traffic Volume Trends

Annually, each State should submit to the FHWA the vehicle classification and truck weight data collected at weigh-in-motion (WIM) sites. Data for the preceding calendar year should be submitted by June 15th. More frequent submissions are also acceptable.

If continuous weigh-in-motion data are available, send up to one week of data per quarter (select any week without a holiday). The data should be addressed as follows:

Federal Highway Administration
Travel Monitoring and Surveys Division, HPPI-30
400 Seventh Street, SW
Washington, D.C. 20590
Attention: Vehicle Travel Information System

All data should be in the record formats described in this section and edited for reasonableness. If the files are large, it is preferable that a compression program such as PKZIP be used to condense them. Please provide the name of a contact person and the telephone number in case further clarification is necessary. For further information, contact the Travel Monitoring and Surveys Division at (202) 366-0175

CHAPTER 2:
STATION DESCRIPTION DATA FORMATS

The Station Description record format is used for all traffic volume, vehicle classification, and truck weight monitoring stations. A Station Description file contains one record for each traffic monitoring station per year. All fields are considered to be character fields. The optional file naming convention is "ssyy.STA", where ss is state postal abbreviation and yy is the last two digits of the year. Table 1 summarizes the Station Description record.

Fields designated as Critical are required for entry into the HVTIS database.

1. Record Type (Column 1) -Critical S = Station description record
   
   
2. FIPS State Codes (Columns 2-3) -Critical
   

State Codes

State	Code	State	Code	State	Code
Alabama	01	Louisiana	22	Ohio	39
Alaska	02	Maine	23	Oklahoma	40
Arizona	03	Maryland	24	Oregon	41
Arkansas	04	Massachusetts	25	Pennsylvania	42
California	05	Michigan	26	Rhode Island	44
Colorado	06	Minnesota	27	South Carolina	45
Connecticut	08	Mississippi	28	South Dakota	46
Delaware	10	Missouri	29	Tennessee	47
D.C.	11	Montana	30	Texas	48
Florida	12	Nebraska	31	Utah	49
Georgia	13	Nevada	32	Vermont	50
Hawaii	15	New Hampshire	33	Virginia	51
Idaho	16	New Jersey	34	Washington	53
Illinois	17	New Mexico	35	West Virginia	54
Indiana	18	New York	36	Wisconsin	55
Iowa	19	North Carolina	37	Wyoming	56
Kansas	20	North Dakota	38	Puerto Rico	72
Kentucky	21

3. Station Identification (Columns 4-9) - Critical
   
   This field should contain an alphanumeric designation for the station where the survey data are collected. Station identification field entries must be identical in all records for a given station. Differences in characters, including spaces, blanks, hyphens, etc., prevent proper match. Right justify the Station ID if it is less than 6 characters. There should be no embedded blanks.
   
   
4. Direction of Travel Code (Column 10) - Critical
   
   Do not combine directions. There should be a separate record for each direction. Whether or not lanes are combined in each direction depends on the next field.
   
   
   

   CODE	DIRECTION
   1	North
   2	Northeast
   3	East
   4	Southeast
   5	South
   6	Southwest
   7	West
   8	Northwest
   9	North-South or Northeast-Southwest combined (ATR stations only)
   0	East-West or Southeast-Northwest combined (ATR stations only)

   
   
   
5. Lane of Travel (Column 11) - Critical
   
   Either each lane is considered a separate station or all lanes in each direction are combined.
   
   

   CODE	LANE
   0	Data with lanes combined
   1	Outside (rightmost) lane
   2-9	Other lanes

   
   Note: The Station ID, Direction of Travel, and Lane of Travel make up the Station Code. There should be one Station Description record per Station Code. Stations can be either by lane or with lanes combined by direction, but not both.
   
   
6. Year of Data (Columns 12-13) - Critical
   
   Code the last two digits of the year in which the data were collected.
   
   
7. Functional Classification Code (Columns 14-15) - Critical
   
   RURAL
   

   CODE	CLASSIFICATION
   01	Principal Arterial - Interstate
   02	Principal Arterial - Other
   06	Minor Arteria
   07	Major Collector
   08	Minor Collector
   09	Local System

   
   
   URBAN
   

   CODE	CLASSIFICATION
   11	Principal Arterial - Interstate
   12	Principal Arterial - Other Freeways or Expressways
   14	Principal Arterial - Other
   16	Minor Arterial
   17	Collector
   19	Local System

   
   
   
8. Number of Lanes in Direction Indicated (Column 16)
   
   Code the number of lanes in one direction at the site. Use "9" if there are more than eight lanes.
   
   
9. Sample Type for Traffic Volume (Column 17)
   
   

   T = Station used for Traffic Volume Trends
   N = Station not used for Traffic Volume Trends
   

   
   
10. Number of Lanes Monitored for Traffic Volume (Column 18)
    
    Code the number of lanes in one direction that are monitored at this site. Use "9" if there are more than eight lanes.
    
    
11. Method of Traffic Volume Counting (Column 19)
    
    

    1 = Human observation (manual)
    2 = Portable traffic recording device
    3 = Permanent automatic traffic recorder (ATR)
    

    
    
12. Sample Type for Vehicle Classification (Column 20)
    
    

    H = Station used for Heavy Vehicle Travel Information System
    N = Station not used for Heavy Vehicle Travel Information System
    

13. Number of Lanes Monitored for Vehicle Classification (Column 21)
    
    Code the number of lanes in one direction that are monitored for vehicle classification at this site. Use "9" if there are more than eight lanes.
    
    
14. Method of Vehicle Classification (Column 22)
    

    1 = Human observation (manual) vehicle classification
    2 = Portable vehicle classification device
    3 = Permanent vehicle classification device
    

15. Algorithm for Vehicle Classification (Column 23)
    
    Code the type of input and processing used to classify vehicles:
    
    

    A = Human observation on site (manual)
    B = Human observation of vehicle image (e.g., video)
    C = Automated interpretation of vehicle image or signature (e.g., video, microwave, sonic)
    D = Vehicle length classification
    E = Axle spacing with ASTM Standard E1572
    F = Axle spacing with Scheme F
    G = Axle spacing with Scheme F modified
    H = Other axle spacing algorithm
    K = Axle spacing and weight algorithm
    L = Axle spacing and vehicle length algorithm
    M = Axle spacing, weight, and vehicle length algorithm
    N = Axle spacing and other input(s) not specified above
    Z = Other means not specified above
    

    
    
16. Classification System for Vehicle Classification (Columns 24-25)
    
    This indicates the total number of classes in the vehicle classification system. The default value is 13 which indicates the standard FHWA 13 class system (see Appendix A). The other vehicle classification systems are based on the HPMS and the Traffic Monitoring System (TMS) documentation. The value that is used will determine the number of count fields needed on the Vehicle Classification Record. In the following list the numbers in parentheses are from the FHWA 13 class system:
    
    

    1 = One class: total volume
    2 = Two classes: non-commercial (classes 1-3) and commercial (classes 4-13) vehicles
    3 = Three classes: non-commercial (classes 1-3), single-unit commercial (classes 4-7), combination commercial (classes 8-13) vehicles
    4 = Four classes: non-commercial (classes 1-3), single-unit commercial (classes 4-7), single-trailer commercial (classes 8-10), multi-trailer commercial       (classes 11-13) vehicles
    5 = Five classes as follows:
    

    1 of 5 = two-axle, two or four-tire vehicles (classes 1-3)
    2 of 5 = buses (class 4)
    3 of 5 = single-unit trucks (classes 5-7)
    4 of 5 = single-trailer combination trucks (classes 8-10)
    5 of 5 = multiple-trailer combination trucks (classes 11-13)
    

    13 = FHWA's standard 13 class system (see Appendix A)
    14 = FHWA's 13 class system plus a class 14 (State or vendor defined)
    15 = FHWA's 13 class system plus classes 14 and 15 (State or vendor defined)
    

    Other numbers = total number of classes used
    
    
17. Sample Type for Truck Weight (Column 26)
    
    

    B = Station used for TMG sample and Strategic Highway Research Program (SHRP) Long Term Pavement Performance (LTPP) sample
    L = Station used for SHRP/LTPP sample (but not TMG sample)
    T = Station used for TMG sample (but not SHRP/LTPP sample)
    N = Station not used for any of the above
    

18. Number of Lanes Monitored for Truck Weight (Column 27)
    
    Code the number of lanes in one direction that are monitored for truck weight at this site. Use "9" if there are more than eight lanes.
    
    
19. Method of Truck Weighing (Column 28)
    

    1 = Portable static scale
    2 = Chassis-mounted, towed static scale
    3 = Platform or pit static scale
    4 = Portable weigh-in-motion system
    5 = Permanent weigh-in-motion system
    

20. Calibration of Weighing System (Column 29)
    
    Code the method used to calibrate the weighing system, e.g., comparing weight-in-motion and weights from static scales.
    

    A = ASTM Standard E1318
    B = Subset of ASTM Standard E1318
    C = Combination of test trucks and trucks from the traffic stream (but not ASTM E1318)
    D = Other sample of trucks from the traffic stream
    M = Moving average of the steering axle of 3S2s
    S = Static calibration
    T = Test trucks only
    U = Uncalibrated
    Z = Other method
    

21. Method of Data Retrieval (Column 30)
    

    1 = Not automated (manual)
    2 = Automated (telemetry)
    

22. Type of Sensor (Column 31)
    
    Code the type of sensor used for traffic detection.
    

    A = Automatic vehicle identification (AVI)
    B = Bending plate
    C = Capacitance strip
    D = Capacitance mat/pad
    E = Hydraulic load cells
    F = Fiber optic - NEW
    G = Strain gauge on bridge beam
    H = Human observation (manual)
    I = Infrared
    K = Laser/lidar
    L = Inductance loop
    M = Magnetometer
    P = Piezoelectric
    Q = Quartz piezoelectric - NEW
    R = Road tube
    S = Sonic/acoustic
    T = Tape switch
    U = Ultrasonic
    V = Video image
    W = Microwave
    X = Radio wave
    Z = Other
    

23. Second Type of Sensor (Column 32)
    
    If there are two types of sensors at the station, code the second using the same codes as Type of Sensor. Otherwise, code "N" for none.

25. LRS Identification (Columns 34-45) - NEW
    
    The LRS Identification reported in this item for the station must be the same as the LRS identification reported in the HPMS for the section of roadway where the station is located. The LRS identification is a 12-character, right justified value. The LRS ID can be alphanumeric, but must not contain blanks; leading zeros must be coded. More information concerning the LRS may be found in Chapter V of the HPMS Field Manual, Linear Referencing System Requirements.
    
    
26. LRS Location Point (Columns 46-51) - NEW
    
    This is the LRS location point for the station. It is similar information to the LRS Beginning Point and LRS Ending Point in the HPMS. The KMPT for the station must be within the range of the LRS beginning point and LRS ending point for the roadway section upon which the station is located. It is coded in kilometers with an implied decimal in the middle: XXX.XXX.
    
    
27. Latitude (Columns 52-59) - NEW
    
    This is the latitude of the station location with the north hemisphere assumed and decimal place understood as XX.XXX XXX.
    
    
28. Longitude (Columns 60-68) - NEW
    
    This is the longitude of the station location with the west hemisphere assumed and decimal place understood as XXX.XXX XXX.
    
    
29. SHRP Site Identification (Columns 69-72) - NEW
    
    If the station replaces another station, give the station ID that was used previously.
    
    
30. Previous Station ID (Columns 73-78)
    
    If the station replaces another station, give the station ID that was used previously. If the site is used in the SHRP/LTPP sample, give the SHRP site ID.
    
    
31. Year Station Established (Columns 79-80)
    
    Code the last two digits of the appropriate year if known.
    
    
32. Year Station Discontinued (Columns 81-82)
    
    Code the last two digits of the appropriate year if known.
    
    
33. FIPS County Code (Columns 83-85)
    
    Use the three-digit FIPS county code (see Federal Information Processing Standards Publication 6, "Counties of the States of the United States").
    
    
34. HPMS Sample Type (Column 86)
    

    N = No, not on an HPMS standard sample section
    Y = Yes, on an HPMS standard sample section
    

35. HPMS Sample Identifier (Columns 87-98)
    
    If the station is on an HPMS standard sample section, code the HPMS Sample Identifier per the HPMS Field Manual (Item 47).
    
    
36. National Highway System (Column 66) - NEW
    

    N = No, not on National Highway System
    Y = Yes, on National Highway System
    

37. Posted Route Signing (Column 100)
    
    This is the same as Route Signing in HPMS Field Manual (Item 22).
    
    

    CODE	DESCRIPTION	CODE	DESCRIPTION
    0	Not signed	5	County
    1	Interstate	6	Township
    2	U.S.	7	Municipal
    3	State	8	Parkway or Forest Route Marker
    4	Off-Interstate Business Marker	9	None of the above

    
    
    
38. Posted Signed Route Number (Columns 101-108)
    
    Code the route number of the principal route on which the station is located. If the station is located on a city street, zero-fill this field. This is the same as Signed Route Number in HPMS Field Manual (Item 24).
    
    
39. Concurrent Route Signing (Column 109)
    
    Code same as Posted Route Signing for concurrent route if there is one.
    
    
40. Concurrent Signed Route Number (Columns 110-117)
    
    Code same as Posted Signed Route Number for concurrent route if there is one.
    
    
41. Station Location (Columns 118-167)
    
    For stations located on a numbered route, enter the distance and direction of the station from the nearest major intersecting route or state border or landmark on state road maps. If the station is located on a city street, enter the city and street name. Abbreviate if necessary. Left justify.

CHAPTER 3:
TRAFFIC VOLUME DATA FORMATS

The Traffic Volume file contains one record for each day of traffic monitoring. All numeric fields should be right-justified and zero-filled. Table 2 summarizes the Hourly Traffic Volume record.

Fields designated as Critical are required for entry into the HVTIS database.

1. Record Type (Column 1) - Critical: 3 = Traffic volume record
   
   
2. FIPS State Code (Columns 2-3) - See Chapter 2. - Critical
   
   
3. Functional Classification Code (Columns 4-5) - See Chapter 2. - Critical
   
   
4. Station Identification (Columns 6-11) - See Chapter 2. - Critical
   
   This should be right-justified and zero-filled. - Critical
   
   
5. Direction of Travel Code (Column 12) - See Chapter 2. - Critical
   
   
6. Lane of Travel (Column 13) - See Chapter 2. - Critical The code for combined lanes (0) is preferred
   
   
7. Year of Data (Columns 14-15) - See Chapter 2. - Critical
   
   
8. Month of Data (Columns 16-17) - Critical
   

   01 = January
   02 = February
   03 = March
   04 = April
   05 = May
   06 = June
   07 = July
   08 = August
   09 = September
   10 = October
   11 = November
   12 = December
   

9. Day of Data (Columns 18-19) - Critical Code the day of the month of data, 01-31. Must correspond to the month of data.
   
   
10. Day of Week (Column 20) - Optional
    

    1 = Sunday
    2 = Monday
    3 = Tuesday
    4 = Wednesday
    5 = Thursday
    6 = Friday
    7 = Saturday
    

  11-34.   Traffic Volume Counted Fields (Columns 21-25, 136-140)

        Enter the traffic volume counted during the hour covered. If the data are missing, code a -1 or blanks.

11 is 00:01 am to 01:00 am
12 is 01:01 am to 02:00 am,
...
...
34 is 11:01 pm to 12:00 midnight

35. Restrictions (Column 141)



0 = no restrictions
1 = construction or other activity affected traffic flow
2 = traffic counting device problem (e.g., malfunction or overflow) - NEW

Table 2: Hourly Traffic Volume Record

(OMB No. 2125-0587 Expiration 4/30/2004)

1. Record Type (Column 1) - Critical C = Vehicle classification record
   
   
2. FIPS State Code (Columns 2-3) - Critical See Chapter 2.
   
   
3. Station Identification (Columns 4-9) - Critical - See Chapter 2.
   
   
4. Direction of Travel Code (Column 10) - Critical - See Chapter 2.
   
   
5. Lane of Travel (Column 11) - Critical - See Chapter 2.

6. Year of Data (Columns 12-13) - Critical - See Chapter 2.
   
   
7. Month of Data (Columns 14-15) - Critical - See Chapter 3.
   
   
8. Day of Data (Columns 16-17) - Critical - See Chapter 3.
   
   
9. Hour of Data (Columns 18-19) - Critical

Code the beginning of the hour in which the count was taken as follows:

00 = 0:01 a.m. to 1:00 a.m.
01 = 1:01 a.m. to 2:00 a.m
...
...
22 = 10:01 p.m. to 11:00 p.m.
23 = 11:01 p.m. to Midnight

10. Total Hourly Volume (Columns 20-24)
    
    

    This numeric field is the total traffic volume for the hour. The total volume is needed because some vehicles might not be classified, in which case the sum of the class counts would not equal the total volume. If the total volume is not collected, leave this field blank or put "-1" (for missing data).
    
    

    The following class count fields are numeric fields with the traffic volume by vehicle class for each hour of data. The number of classes is determined by the "Classification System for Vehicle Classification" field in the Station Description record for the station. The default classification system is the FHWA 13 class system (see Appendix A).
    
    

    These counts should be checked for reasonableness. For example, Class 13 should not be larger than 99. VTRIS allows users to set a limit for each class count.
    
    
11. Class 1 Count (Columns 25-29) - Optional
    
    
    Class 1 is for Motorcycles, which is an optional class. If motorcycles are not counted, enter "-1" or blanks in the Class 1 field.
    
    
12. Class 2 Count (Columns 30-34) - Critical: Class 2 is for Passenger Cars.
    
    
13. Class 3 Count (Columns 35-39) - Optional:
    
    

    Class 3 is for Other Two-Axle, Four-Tire, Single-Unit Vehicles. However, classes 2 and 3 may be combined, in which case the total for both classes should be entered in the class 2 field and "-1" or blanks in the Class 3 field.
    
    
14. Class 4 Count (Columns 40-44) - Critical: Class 4 is for Buses.
    
    
15. Class 5 Count (Columns 45-49) - Critical: Class 5 is for Two-Axle, Six-Tire, Single-Unit Trucks.
    
    
16. Class 6 Count (Columns 50-54) - Critical: Class 6 is for Three-Axle, Single-Unit Trucks.
    
    
17. Class 7 Count (Columns 55-59) - Critical: Class 7 is for Four-or-More Axle, Single-Unit Trucks.
    
    
18. Class 8 Count (Columns 60-64) - Critical: Class 8 is for Four-or-Less Axle, Single-Trailer Trucks.
    
    
19. Class 9 Count (Columns 65-69) - Critical: Class 9 is for Five-Axle, Single-Trailer Trucks.
    
    
20. Class 10 Count (Columns 70-74) - Critical: Class 10 is for Six-or-More Axle, Single-Trailer Trucks.
    
    
21. Class 11 Count (Columns 75-79) - Critical: Class 11 is for Five-or-Less Axle, Multi-Trailer Trucks.
    
    
22. Class 12 Count (Columns 80-84) - Critical: Class 12 is for Six-Axle, Multi-Trailer Trucks.
    
    
23. Class 13 Count (Columns 85-89) - Critical: Class 13 is for Seven-or-More Axle, Multi-Trailer Trucks.
    
    
    The Vehicle Classification record may be ended here if exactly 13 classes are used. However, some automatic vehicle classification systems have one or two more classes usually designating "Unclassified" or "Unclassifiable" vehicles. If Class 14 and/or Class 15 are included such that the total of all the classes equals the total volume, then the Total Volume field may be left blank.
    
    
24. Class 14 Count (Columns 90-94) -Optional: If a Class 14 is used, enter the count for the hour here.
    
    
25. Class 15 Count (Columns 95-99) - Optional: If a Class 15 is used, enter the count for the hour here.

1. Record Type (Column 1) - Critical W = Truck weight record
2. FIPS State Code (Columns 2-3) - Critical - See Chapter 2.
3. Station Identification (Columns 4-9) - Critical - See Chapter 2.
4. Direction of Travel Code (Column 10) - Critical - See Chapter 2.
5. Lane of Travel (Column 11) - Critical - See Chapter 2.

6. Year of Data (Columns 12-13) - Critical - See Chapter 2.
7. Month of Data (Columns 14-15) - Critical - See Chapter 3.
8. Day of Data (Columns 16-17) - Critical - See Chapter 3.
9. Hour of Data (Columns 18-19) - Critical

Code the beginning of the hour in which the count was taken:

00 = 0:01 a.m. to 1:00 a.m.
01 = 1:01 a.m. to 2:00 a.m
...
...
22 = 10:01 p.m. to 11:00 p.m.
23 = 11:01 p.m. to Midnight.

10. Vehicle Class (Columns 20-21) - Critical Enter the class of the vehicle from FHWA Vehicle Classes 1 to 13. Classes 1 - 3 are ordinarily omitted.
    
    

    A dummy vehicle class of -1 indicates that weight data for this hour are missing. A dummy vehicle class of 0 indicates that weight data for this hour are not missing, and thus if there are no Truck Weight records for the hour, then there were no trucks during that hour. Without these indications, no Truck Weight records for an hour might be interpreted to mean that the WIM system was not working.
    
    
11. Open (Columns 22-24) - Optional
    
    
    This field is for special studies or state use such as for vehicle speed (kilometers per hour) or pavement temperature (degrees Celsius in the range -99 to +99).
    
    
12. Total Weight of Vehicle (Columns 25-28)
    
    Enter the gross vehicle weight to the nearest tenth of a metric ton (100 kilograms) without a decimal point. This should equal the sum of all the axle weights except for rounding.
    
    
13. Number of Axles (Columns 29-30)

14. A-axle Weight (Columns 31-33)
    
    
15. A-B Axle Spacing (Columns 34-36)
    
    
16. B-axle Weight (Columns 37-39)
    
    
17. B-C Axle Spacing (Columns 40-42)
    
    
18. C-axle Weight (Columns 43-45)
    
    
19. C-D Axle Spacing (Columns 46-48)
    
    
20. D-axle Weight (Columns 49-51)
    
    
21. D-E Axle Spacing (Columns 52-54)
    
    
22. E-axle Weight (Columns 55-57)
    
    
23. E-F Axle Spacing (Columns 58-60)
    
    
24. F-axle Weight (Columns 61-63)
    
    
25. F-G Axle Spacing (Columns 64-66)
    
    
26. G-axle Weight (Columns 67-69)
    
    
27. G-H Axle Spacing (Columns 70-72)
    
    
28. H-axle Weight (Columns 73-75)
    
    
29. H-I Axle Spacing (Columns 76-78)
    
    
30. I-axle Spacing (Columns 79-81)
    
    
31. I-J Axle Spacing (Columns 82-84)
    
    
32. J-axle Weight (Columns 85-87)
    
    
33. J-K Axle Spacing (Columns 88-90)
    
    
34. K-axle Weight (Columns 91-93)
    
    
35. K-L Axle Spacing (Columns 94-96)
    
    
36. L-axle Weight (Columns 97-99)
    
    
37. L-M Axle Spacing (Columns 100-102)
    
    
38. M-axle Weight (Columns 103-105)
    

1. Motorcycles (Optional) -- All two or three-wheeled motorized vehicles. Typical vehicles in this category have saddle type seats and are steered by handlebars rather than steering wheels. This category includes motorcycles, motor scooters, mopeds, motor-powered bicycles, and three-wheel motorcycles. This vehicle type may be reported at the option of the State.
   
   
2. Passenger Cars -- All sedans, coupes, and station wagons manufactured primarily for the purpose of carrying passengers and including those passenger cars pulling recreational or other light trailers.
   
   
3. Other Two-Axle, Four-Tire Single Unit Vehicles -- All two-axle, four-tire, vehicles, other than passenger cars. Included in this classification are pickups, panels, vans, and other vehicles such as campers, motor homes, ambulances, hearses, carryalls, and minibuses. Other two-axle, four-tire single-unit vehicles pulling recreational or other light trailers are included in this classification. Because automatic vehicle classifiers have difficulty distinguishing class 3 from class 2, these two classes may be combined into class 2.
   
   
4. Buses -- All vehicles manufactured as traditional passenger-carrying buses with two axles and six tires or three or more axles. This category includes only traditional buses (including school buses) functioning as passenger-carrying vehicles. Modified buses should be considered to be a truck and should be appropriately classified.
   NOTE: In reporting information on trucks the following criteria should be used:
   
   
1. Truck tractor units traveling without a trailer will be considered single-unit trucks.
   
   
2. A truck tractor unit pulling other such units in a "saddle mount" configuration will be considered one single-unit truck and will be defined only by the axles on the pulling unit.
   
   
3. Vehicles are defined by the number of axles in contact with the road. Therefore, "floating" axles are counted only when in the down position.
   
   
4. The term "trailer" includes both semi- and full trailers.
   
   
5. Two-Axle, Six-Tire, Single-Unit Trucks -- All vehicles on a single frame including trucks, camping and recreational vehicles, motor homes, etc., with two axles and dual rear wheels.
   
   
6. Three-Axle Single-Unit Trucks -- All vehicles on a single frame including trucks, camping and recreational vehicles, motor homes, etc., with three axles.
   
   
7. Four or More Axle Single-Unit Trucks -- All trucks on a single frame with four or more axles.
   
   
8. Four or Fewer Axle Single-Trailer Trucks -- All vehicles with four or fewer axles consisting of two units, one of which is a tractor or straight truck power unit.
   
   
9. Five-Axle Single-Trailer Trucks -- All five-axle vehicles consisting of two units, one of which is a tractor or straight truck power unit.
   
   
10. Six or More Axle Single-Trailer Trucks -- All vehicles with six or more axles consisting of two units, one of which is a tractor or straight truck power unit.
    
    
11. Five or fewer Axle Multi-Trailer Trucks -- All vehicles with five or fewer axles consisting of three or more units, one of which is a tractor or straight truck power unit.
    
    
12. Six-Axle Multi-Trailer Trucks -- All six-axle vehicles consisting of three or more units, one of which is a tractor or straight truck power unit.
    
    
13. Seven or More Axle Multi-Trailer Trucks -- All vehicles with seven or more axles consisting of three or more units, one of which is a tractor or straight truck power unit.

If you have any questions, email us, or phone 202-366-0170.