Traffic Monitoring Guide

Appendix J. TMAS 2.0 QUALITY CONTROL CHECKS

STATION DATA

    Duplicates within the batch

    Duplicates against the National Database

    Fatal errors

             no S or 1 in the 1st digit of the record

             record length less than 167 characters

             no station ID in the record (columns 4-9)

    Critical errors occur if:

             blank or invalid direction or lane

             blank or invalid functional classification

             blank or invalid state code

             improper vehicle classification designated (column 24-25)

              (all critical errors are correctable in TMAS)

    Caution flags include:

             missing Latitude/Longitude

             missing Year Established

             missing route number

             missing number of lanes for volume, classification or weight

             missing HPMS Sample, NHS or type of sensor

              (all caution errors are correctable in TMAS)

    Warning flags occur if:

             any two records that have all digits being exact duplicates will have one record removed

VOLUME DATA (TMG 3-CARD) - MONTHLY

    Duplicates within the batch

    Fatal errors occur if:

             no 3 in the 1st digit of the record

             record length less than 141 characters

             no station ID in the record (columns 6-11)

             no corresponding station in National Database

    Critical errors occur if:

             record includes 7 or more consecutive zero hours

             every DOW (day of week) not present for the given site/month/year

             record includes any zero hour volume with one or more boundary with over 50 vehicles

             24 hours of data not in a given record

             any hourly volume exceeds the max per hour per lane value

             directional splits check show unbalanced directional volumes greater than 10%

                          variance from 50%

             Monthly Average Daily Traffic (MADT) from same month previous year not within 20%

             State marks data as restricted in column 141

    Warning flags occur if:

             any two records that have all digits being exact duplicates will have one record removed

CLASSIFICATION DATA (TMG C-CARD) - MONTHLY

    Duplicates within the batch

    Fatal error occurs if:

             no C in the 1st digit of the record

             record length less than number of characters based on station data field 15

             no station ID in the record (columns 4-9)

             no corresponding station in National Database

    Critical errors occur if:

             volume checks done on all classification data – see volume section above

             all classification data utilizes the station file algorithm for vehicle classification (23)

                          and classification system for vehicle classification (24-25) for determining the

                          length of the given record

    Caution flags occur if:

             maximum percentage by classification by day check (done by direction)

             historical check for 6 weeks of prior approved data based on the same DOW for each class of

                          vehicle by day

             any historical quality control check where insufficient historical data is available

    Warning flags

             any two records that have all digits being exact duplicates will have one record removed

WEIGHT DATA (TMG W-CARD) - MONTHLY

    Duplicates within the batch

    Fatal error occurs if:

             no W in the 1st digit of the record

             record length less than 39 characters

             no station ID in the record (columns 4-9)

             any record with more than 25 axles will not be kept in TMAS 2.0

    Critical error occurs if:

             none

    Caution flags

             total weight (25-28) not equal to the sum of all axle weights

             every axle weight not within acceptable range (1 kip to 50 kip)

             any inter-axle spacing not within acceptable range (1’ to 50’)

             sum of axle spacings by vehicle classification not within acceptable range

             number of axles by vehicle class exceeded

             historical check for 8 weeks of data using the steering axle weight average (SAWA) by

                          day by lane check based on the same DOW for class 9 vehicles

             historical check for 8 weeks of data using the average tandem axle spacing (ATS) average by

                          day by lane based on the same DOW for classes 8-13 vehicles

             any historical quality control check where insufficient historical data is available

    Warning flags

             any record with between 13 and 25 will not be processed in TMAS 2.0 but will be placed in a

                          special database.

             any two records that have all digits being exact duplicates will have one record removed