U.S. Department of Transportation
Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC 20590
202-366-4000


Skip to content
Facebook iconYouTube iconTwitter iconFlickr iconLinkedInInstagram

Federal Highway Administration Research and Technology
Coordinating, Developing, and Delivering Highway Transportation Innovations

 
REPORT
This report is an archived publication and may contain dated technical, contact, and link information
Back to Publication List        
Publication Number:  FHWA-HRT-16-059    Date:  November 2017
Publication Number: FHWA-HRT-16-059
Date: November 2017

 

Travel Time Displays At Freeway Entrance Approaches

508 Captions

Figure 1. Photo. Travel time information display in Atlanta, GA. This photo depicts a travel-time information display above a highway in Atlanta, GA. The sign reads “I-575/EXIT 268, 7 MI AHEAD, TRAVELTIME 13-15 MIN.”

Figure 2. Map. Participants’ current locations in the hypothetical scenario. This map shows the Bethesda, MD, area inside the I-495 beltway. Markers on the map display the location of two project participants, one on I-270 South and the other on Route 355 South.

Figure 3. Screenshot. Example of scenario presented to participants. This screenshot shows a scenario presented to participants. The left side of the figure shows the following text, “It is your typical morning commute and you are traveling to work southbound on Route 355. You are approaching Route 118. You have a meeting so it is important to arrive on time. The following video shows the traffic conditions on this road this morning….” The right side of the figure shows a car braking in traffic.

Figure 4. Screenshot. Rating form given to participants. This screenshot shows the rating form given to participants. The rating form shows three questions scored on a 1 to 10 scale. The three questions are as follows:

Figure 5. Illustration. ATT sign formats and content: Stimulus 1. This figure is one of a series of illustrations of arterial travel time signs that convey different information to participants. Stimulus 1 has a black background with yellow dots comprising the letters and numbers depicted. The messaging reads as follows: “I-270 TIME TO SHADY GR RD 17 MIN, MONTROSE RD 22 MIN.”

Figure 6. Illustration. ATT sign formats and content: Stimulus 2. This figure is one of a series of illustrations of arterial travel time signs that convey different information to participants. Stimulus 2 has a black background with yellow dots comprising the letters and numbers depicted. The messaging reads as follows: “FROM I-270 RAMP SHADY GR RD 17 MIN, MONTROSE RD 22 MIN.”

Figure 7. Illustration. ATT sign formats and content: Stimulus 3. This figure is one of a series of illustrations of arterial travel time signs that convey different information to participants. Stimulus 3 has a black background with yellow dots comprising the letters and numbers depicted. The messaging reads as follows: “I-270 FROM RT 118 TO I-370 15 MIN, TO RT 28 18 MIN.”

Figure 8. Illustration. ATT sign formats and content: Stimulus 4, phase 1. This figure is one of a series of illustrations of arterial travel time signs that convey different information to participants. Stimulus 4, phase 1, has a black background with yellow dots comprising the letters and numbers depicted. It is the first phase of a two-phase sign. The messaging reads as follows: “ESTMATED TIME VIA I-270.”

Figure 9. Illustration. ATT sign formats and content: Stimulus 4, phase 2. This figure is one of series of illustrations of arterial travel time signs that convey different information to participants. Stimulus 4, phase 2, has a black background with yellow dots comprising the letters and numbers depicted. It is the second phase of a two-phase sign. The messaging reads as follows: “I-370 15 MIN, MONTROSE RD 22 MIN.”

Figure 10. Illustration. ATT sign formats and content: Stimulus 5. This figure is one of a series of illustrations of arterial travel time (ATT) signs that convey different information to participants. Stimulus 5 has a black background with yellow dots comprising the letters and numbers depicted. The messaging reads as follows: “I-270 TIME TO SHADY GR RD 17 MIN, MONTROSE RD 22 MIN.” A static message in black on white below the changeable ATT sign reads “Travel times from I-270 ramp.”

Figure 11. Illustration. ATT sign formats and content: Stimulus 6. This figure is one of a series of illustrations of arterial travel time signs that convey different information to participants. Stimulus 6 has a black background with yellow dots comprising the letters and numbers depicted. The messaging reads as follows: “I-270 DELAYS TO MONT VLG AVE 4 MIN, MONTROSE RD 10 MIN.”

Figure 12. Illustration. ATT sign formats and content: Stimulus 7. This figure is one of a series of illustrations of arterial travel time signs that convey different information to participants. Stimulus 7 has a black background with yellow dots comprising the letters and numbers depicted. The messaging reads as follows: “FREEWAY TIME TO MONG VLG AVE 9 MIN, MONTROSE RD 22 MIN.”

Figure 13. Illustration. ATT sign formats and content: Stimulus 8. This figure is one of a series of illustrations of arterial travel time signs that convey different information to participants. Stimulus 8 is a hybrid sign. Static elements include an identification of the information being conveyed on the sign, which is “I-270 TRAVEL TIME,” a vertical color-coded thermometer that ranges from green through yellow to red, and text elements. A white upward-pointing arrow is at the base of the thermometer, and static text at the base of the thermometer reads “Route 118.” Halfway up the sign, static text reading “Shady Grove Rd” is to the left of a dynamic display indicating 17 min travel time. This text is positioned adjacent to the middle of the yellow-colored band on the thermometer. At the top of the sign, static text reading “Montrose Rd 22 minutes” is adjacent to the top of the red-colored band on the thermometer.

Figure 14. Illustration. ATT sign formats and content: Stimulus 9. This figure depicts one of a series of illustrations of arterial travel time signs that convey different information to participants. Stimulus 9 has a black background with yellow dots comprising the letters and numbers depicted. The messaging reads as follows: “TO MONTROSE RD VIA I-270 22 MIN, VIA RT 355 22 MIN.”

Figure 15. Illustration. ATT sign formats and content: Stimulus 10. This figure is one of a series of illustrations of arterial travel time signs that convey different information to participants. Stimulus 10 has a black background with yellow dots comprising the letters and numbers depicted. The messaging reads as follows: “MIN TO MONTROSE RD FROM I-270 RAMP 22 MIN, VIA RT 355 22 MIN.”

Figure 16. Illustration. ATT sign formats and content: Stimulus 11. This figure is one of a series of illustrations of arterial travel time signs that convey different information to participants. Stimulus 11 is a hybrid sign. It contains static elements, including an identification of the information being conveyed on the sign, which is “TRAVEL TIME TO” and the image of a route identification sign that reads as follows: “Maryland Route 28.” The hybrid sign depicts two parallel vertical lines, one in green (left) and one in yellow (right). At the bottom of the green line is a white arrow pointing upward. Adjacent to the base of the green line is a route sign that reads as follows: “Maryland 355.” At the top of the green line is a dynamic display that reads as follows: “17 minutes.” To the right of the yellow line, an interstate shield reading “Interstate 270” is located adjacent to the bottom of the yellow line. At the top is a dynamic display that reads as follows: “17 minutes.”

Figure 17. Illustration. Sign number 9-2. This figure is an example of a dynamic message sign. The display reads as follows: “to shady gr metro via i-270 19 min, via rt 355 15 min.”

Figure 18. Illustration. Sign number 9-1. This figure is a hybrid message sign with static text and a dynamic travel time display. The sign reads as follows: “TRAVEL TIME TO SHADY GROVE METRO VIA I-270 19 MIN, VIA MARYLAND 355 15 MIN.”

Figure 19. Illustration. Sign number 9-3. This figure compares two hybrid signs, one above the other, containing a dynamic element and static text. The top sign contains a dynamic display on the left and text on the right. The message from this sign is that, if the participant turns right, the travel time to Shady Grove Metro would be 19 min. The bottom sign contains the same format with the dynamic display on the left and text on the right. The message from this sign is that if the participant goes straight, the travel time to Shady Grove Metro would be 15 min.

Figure 20. Illustration. Sign number 2-5. This figure is an example of a dynamic message sign. The display reads as follows: “i-270 time to shady gr rd 17 min, Montrose rd 22 min.”

Figure 21. Illustration. Sign number 2-3. This figure is a hybrid sign containing static elements that include an identification of the information being conveyed on the sign, which is “I-270 TRAVEL TIME,” a vertical color-coded thermometer on the right of the sign that ranges from green through yellow to red, and text elements. A white upward pointing arrow is at the base of the thermometer, and static text at the base and to the left of the thermometer reads “Route 118.” Halfway up the sign, static text reading “Shady Grove Rd” is to the left of a dynamic display indicating 17 min travel time. This text is positioned adjacent and to the left of the middle of the yellow-colored band on the thermometer. At the top of the sign, static text reading “Montrose Rd” is adjacent to a dynamic display indicating 22 min travel time. This text is to the left of the top of the red-colored band on the thermometer.

Figure 22. Illustration. Sign number 6-4. This figure is an example of a dynamic message sign. The display reads as follows: “To Montrose rd via i-270 22 min, via rt 355 22 min.”

Figure 23. Illustration. Sign number 6-5. This figure is a hybrid sign that contains static elements, including an identification of the information being conveyed on the sign, which is “TRAVEL TIME TO” and the image of a route identification sign that reads as follows: “Maryland Route 28.” The hybrid sign depicts two parallel vertical lines, one in green (left) and one in yellow (right). At the bottom of the green line is a white arrow pointing upward. Adjacent to the base of the green line is a route sign that reads as follows: “Maryland 355.” At the top of the green line is a dynamic display that reads “17 minutes.” To the right of the yellow line, an interstate shield reading “Interstate 270” is located adjacent to the bottom of the yellow line. At the top is a dynamic display that reads “17 minutes.”

Figure 24. Chart. Average confidence, ease of use, and willingness to divert ratings for all signs. This chart plots participant ratings on the vertical axis over the sequence of signs on the horizontal axis. The chart plots confidence in one’s knowledge to make the best decision; ease of use of signs; and willingness to divert to another route for all signs presented during this experiment. All three plots largely fluctuate between approximately 8 and 9, with a few exceptions.

Figure 25. Map. ArcGIS™ map illustrates neighborhoods of participants and location of personalized signs. This map plots the locations of participants’ neighborhoods and the locations of their personalized signs on a map. The signs and neighborhoods are clustered within roughly 2 mi of I-270 in Germantown, MD.

Figure 26. Chart. Sign placement. This chart shows the number of sign placements (y-axis) grouped by the number of alternatives before getting on I-270 (x-axis) for each of the following:

Figure 27. Map. ArcGIS™ map illustrates population density by census block. This map plots the personalized sign locations overlaid with population density by census block for the region. The signs are mostly clustered on approaches to I-270 and at the edges of densely populated neighborhoods.

Figure 28. Map. ArcGIS™ map illustrates potentially optimal routes to I-270. This map plots the personalized sign locations overlaid with calculated optimal routes from participants’ neighborhoods. The map shows that signs were not typically placed on optimally calculated routes.

Figure 29. Chart. Type of information on personalized CMS signs. This chart shows the number signs (y-axis) plotted against the type of information displayed on personalized changeable message signs (x-axis). Data shown are as follows:

Figure 30. Chart. Number of destinations and destination locations. This chart plots the number of locations and destination locations. Numbers of locations were the following:

Locations were the following:

Figure 31. Chart. Destinations via different roadways. This chart shows whether users want their changeable message sign displays to reflect travel time information for a freeway (I-270), arterial, or both. Data shown are as follows:

Figure 32. Map. Field implementation sign location (latitude: 38.5717, longitude: −77.3173). This map shows the field implementation sign location in Dumfries, VA, on Route 1 northbound before the intersection with Route 234.

Figure 33. Photo. Travel time information display in Dumfries, VA. This photo shows a travel time information display sign in Dumfries, VA.

Figure 34. Illustration. Example of information shown on the travel time display. This illustration shows an example of information from a travel time display. The example displays “VA 123 VIA I-95 N, 10 MILES, 12 MINUTES.”

Figure 35. Illustration. Example of in-vehicle device display. This illustration shows an example of an in-vehicle device display. The example displays “Lorton Rd Via US-1 N, 12 Miles, 24 Minutes.”

Figure 36. Map. ArcGIS™ map identifies GPS data points, including eligible (along US-1N and I-95) and ineligible trips (red circles). This map shows Global Positioning System data points, including eligible and ineligible trips. The eligible trips progress northbound on Route 1 or use Route 234 to access I-95 N. The ineligible trips are drivers who go south on I-95 or who cross I-95 on Route 234 and continue traveling northwest.

Figure 37. Chart. Percentage of trips using I-95 or Route 1. This chart shows the percentage of trips using I-95 or Route 1 before and after installation of the signs. Data shown are the following:

Figure 38. Chart. Pre-trip information sources. This chart shows travelers’ pre-trip information sources before and after the study. Data shown are the following

Figure 39. Chart. Pre-trip information sources reported for actual trips taken. This chart shows travelers’ pre-trip information sources before and after the study. Data shown are the following:

Figure 40. Chart. En route traveler information sources. This chart shows the distribution of responses when participants were asked “From what sources of information did you receive traveler information during the trip?” The chart shows plots for the following information sources before and after the study:

Figure 41. Chart. En route traveler information sources when traveling through the study corridor. This chart shows the distribution of responses when participants were asked “From what sources of information did you receive traveler information within the study corridor?” The chart shows plots for the following information sources before and after the study:

Figure 42. Chart. Mean agreement ratings for route choice influence. This chart shows the following mean agreement ratings for route choice influence on a scale of 1 to 5:

Figure 43. Chart. Mean agreement ratings for usefulness. This chart shows the following mean agreement ratings for usefulness on a scale of 1 to 5:

Figure 44. Chart. Mean agreement ratings for confidence. This chart shows the following mean agreement ratings on a scale of 1 to 5 for confidence for travel time information:

Confidence about making the best decision about routes rates was as follows:

Figure 45. Chart. Mean agreement ratings for ease of understanding and overall likeability. This chart shows the following mean agreement ratings on a scale of 1 to 5 for roadside and device travel time information:

Figure 46. Chart. Mean overall ratings on several dimensions. This chart shows mean overall ratings on a scale of 1 to 5 for roadside travel time signs and the study-provided device based on the following criteria:

Figure 47. Chart. Mean percentage of responses of each influence rating for combination information. This chart shows the following mean proportions of responses for each influence rating for combination information on the vertical axis against how often this information influenced route choice on a scale of 1 to 10 on the horizontal axis:

Figure 48. Chart. Type of information on personalized CMS signs chosen by participants. This chart shows the type of information on personalized changeable message signs chosen by participants. Data are shown as follows:

Figure 49. Illustration. Travel time display featuring concise information. This figure is an illustration of a travel time display featuring concise information. The display reads as follows: “Travel Time to Shady Grove 10 Min, River RD 28 Min.”

Figure 50. Illustration. Dynamic travel time information display. This illustration depicts an example of a hybrid travel time information display with static text and dynamic travel times. The display reads as follows: “Travel Times to: River Rd 28 MIN; Clara Barton 32 MIN.”

Figure 51. Illustration. Dynamic travel time sign #2. This figure is an example of a hybrid travel time sign and is labeled #2. The static elements are text, and the dynamic elements are the travel times. The sign indicates that the travel time is 10 min to Shady Grove Road, 16 min to W. Montgomery, 19 min to Montrose Road, and 24 min to Democracy Boulevard. A color-coded bar to the right of these travel times is yellow for all segments except the Shady Grove Rd to W. Montgomery segment, which is red.

Figure 52. Illustration. Dynamic travel time sign #3. This illustration shows an example of dynamic travel time sign and is labeled #3. The sign contains a Y shape in the middle representing a roadway on the approach to a split. At the bottom of the Y shape is a white arrow, indicating the direction of traffic. The bottom of the Y goes from green to yellow to red, indicating increasing congestion. At the split, the left arm of the Y extends up and left and is labeled I-495 East. This segment is red from the intersection of the leg to about two-thirds of the way up, where it becomes yellow. At the top of the arm, static text reads “Georgia Ave,” and the dynamic travel time display reads “27 min.” At the split, the right arm of the Y extends up and right and is labeled I-495 South. This segment is yellow from the intersection of the leg to about two-thirds of the way up, where it becomes red. At the top of the arm, static text reads “Geo Wash Pkwy,” and the dynamic travel time display reads “24 min.”

Figure 53. Illustration. Dynamic travel time sign #1. This illustration shows an example hybrid travel time sign and is labeled #1. The sign contains static text and dynamic travel time displays from the point of the sign up to Rockville (14 min) and up to Bethesda (24 min). A color-coded thermometer display to the right of the sign indicates the trip to Rockville is mildly congested (yellow), and the trip from Rockville to Bethesda is very congested (red).

Figure 54. Illustration. Sign 3. This figure is one of a series of illustrations depicting different dynamic messages showing destination information. Sign 3 reads as follows: “TRAVEL TIME TO SHADY GROVE 10 MIN, FALLS RD 16 MIN, MONTROSE RD 19 MIN, DEMOCRACY 24 MIN.”

Figure 55. Illustration. Sign 2. This figure is one of a series of illustrations depicting different dynamic messages showing destination information. Sign 2 reads as follows: “TRAVEL TIME TO SHADY GROVE 10 MIN, FALLS RD 16 MIN, MONTROSE RD 19 MIN.”

Figure 56. Illustration. Base 1. This figure is one of a series of illustrations depicting different dynamic messages showing destination information. Base 1 reads as follows: “TRAVEL TIME TO SHADY GROVE 10 MIN, RIVER RD 28 MIN.”

Figure 57. Illustration. Sign 19. This figure is one of a series of illustrations depicting different dynamic messages showing destination information. Sign 19 reads as follows: “TRAVEL TIME TO FALLS RD 10 MIN, GW PKWY 34 MIN.”

Figure 58. Illustration. Updated sign example. This figure illustrates a dynamic sign that reads as follows: “TRAVEL TIME TO SHADY GROVE 10 MIN, DEMOCRACY 19 MIN.” Below the dynamic sign is a static message that advises the message is updated every 3 min.

Figure 59. Illustration. Example of a sign with left and right justifications. This illustration shows an example of a sign with a centered header, left-justified destination, and right-justified travel times. The sign reads as follows: “Travel Time to Falls Rd 10 Min, GW Parkway 34 Min.”

Figure 60. Illustration. Example of a sign featuring concise information. This illustration shows an example of a sign with concise information—no more than six units of information and two units of information per line. The display reads as follows: “Travel time to Shady Grove 10 Min, River Rd 28 Min.”

Figure 61. Illustration. Example of a sign demonstrating recommended capitalization and abbreviation. This illustration shows an example of a sign demonstrating recommended capitalization (all capitals) and abbreviation (standard street abbreviations and “MIN” for minutes). The display reads as follows: “TRAVEL TIME TO FALLS RD 10 MIN, GW PKWY 34 MIN.”

Figure 62. Illustration. Travel time information display with optimal format (example #1). This illustration shows a travel time information display with optimal format, labeled example #1. The display has a centered header, left-justified street names, and right-justified travel times. The display reads as follows: “Travel time to Shady Grove 10 Min, River Rd 28 Min.”

Figure 63. Illustration. Travel time information display with optimal format (example #2). This photo shows a travel time information display with optimal format, labeled example #2. The display has a centered header, left-justified street names, right-justified travel times, and centered sub-head header. The display reads as follows: “Travel Time to Falls Rd 16 Min, Use Alt Rte.”

APPENDIX A.

Illustration. Flyer used by the research team to recruit drivers to participate. The flyer reads as follows: “Drivers needed for traffic study. Do you drive along Route 1 North to work? Help improve traffic information in your community! Receive $200 for participation! Refer an eligible friend for an extra $20! To be eligible, you must drive past the red X on Route 1 North during your morning commute. Contact Us: Visit www.VAcommuters.org. Call (301)738-8341. Email TravelTimeStudy@westat.com.” The flyer also includes a map of the study area along Route 1 in Dumfries, Virginia. On this map, a red X is slightly lower and left of center, placed over Fraley Blvd.

Illustration. Advertisement used by the research team to recruit drivers to participate. The advertisement reads as follows: “We need your help to improve traffic information for Virginia commuters! If you live in the Dumfries or Triangle areas you may be eligible to participate in a traffic study and receive $200. To be eligible to participate, you must: Commute northbound during the morning rush hour; Typically drive on Route 1 North to or beyond Route 234 (Dumfries Road) for at least part of your normal commute. Participants will receive a device to place in their cars for up to nine weeks. The device will identify your route choice only during your morning weekday commutes. The device will not identify where your trip begins and ends. Some participants will receive new technology displaying travel time information. Participants will also be asked to complete brief questionnaires. Only one person per household is eligible to participate. Referral Program. Whether or not you participate in this study, you can earn $20 for each person that you refer to us who is accepted into the study. To earn a referral, have someone who meets the requirements for this study call Westat and provide us with your name, telephone number, and/or email address. We will contact you and arrange to send you a check for $20 per referral. There is no limit to the number of referral bonuses you can earn. Contact Us. For more information, please call (301)738-8341 or send an e-mail to TravelTimeStudy@westat.com. This study is funded by the U.S. Department of Transportation and conducted by Westat, a research firm located in Rockville, MD.” This advertisement includes a QR code in the bottom-right corner linking to additional information on the study.

APPENDIX B.

Cover page. Photo. Dense traffic on a six-lane highway. This point-of-view photo shows dense traffic on a six-lane highway.

Under “Package Materials,” Item 7. Photo. The Nexus 5 Travel Time Device used during the study. This photo shows the Nexus 5 Travel Time Device used during the study. It is a black rectangular device similar in appearance to a smartphone.

Under “Package Materials,” Item 8. Photo. A windshield mount for the study device. This photo shows a windshield mount for the study device. It is a black device with a holder slightly larger than the Nexus 5 Travel Time Device, and an arm that extends from the back of the holder with a suction on the end that will be applied to the windshield to secure the mount in place.

Under “Package Materials,” Item 9. Photo. A USB charging cable. This photo shows a USB charging cable. It is a black cable with a square USB connector on one end and a mini USB connector on the other end.

Under “Package Materials,” Item 10. Photo. A car port power splitter. This photo shows a car port power splitter. The power splitter is a rectangular black box about twice the size of a pack of cigarettes, with several ports to supply power to several devices.

Under “Completing the Consent Form,” “Step 1: Selecting a Mounting Location.” Photos. Three photos, along with text, illustrate two correctly mounted devices and one incorrectly mounted device. The first image shows a recommended location, placing the mount low on the windshield near the center of the dashboard. The text in this image reads as follows: “Recommended location: Place the mount low down on your windshield near the center of your dashboard.” The second image shows a recommended location mounted up high, just below the rear-view mirror. The text in this image reads as follows: “Alternate location: Place the mount up high, just below your rear view mirror.” The third image shows a location not recommended for mounting—in the center of the windshield in a way that obstructs the view of the road. The text in this image reads as follows: “NOT RECOMMENDED: Do not place the mount in a way that obstructs your view of the road, like in the center of the windshield.”

Under “Completing the Consent Form,” “Step 2: Placing the Mount.” Photo. User correctly installing the mount. This photo shows the user using fingers to twist the wheel of the mount clockwise to tighten the mount. An arrow indicates the clockwise direction.

Under “Completing the Consent Form,” “Step 3: Making Adjustments.” Photo. Arrows superimposed on a mount indicate the locations where the mount can be adjusted up or down and side to side. This photo shows where the user can adjust the mount up or down, or side to side. Text in this photo reads as follows: “Up/Down adjustment.”

Under “Completing the Consent Form,” “Step 4: Placing the Device,” Item 1. Photo. Arrow pointing to plastic hinges on the mount used to secure the device. This photo shows an arrow pointing to the location of small plastic hinges on the mount that are used to secure the device in place.

Under “Completing the Consent Form,” “Step 4: Placing the Device,” Item 2. Photos. Photos showing how to open the top and bottom prongs of the mount. The left photo displays a red circle over a black button located on the back of the mount face that opens the top and bottom prongs of the mount. The photo on the right shows an empty open mount.

Under “Completing the Consent Form,” “Step 4: Placing the Device,” Item 3. Photo. Arrows indicate the locations of the power and volume buttons on the study device. This photo shows arrows that indicate the locations of the power and volume buttons on the study device. The text of the arrow pointing to the top corner of the device reads as follows: “Power button.” The text of the arrow pointing to the corresponding bottom corner of the device reads as follows: “Volume buttons.”

Under “Completing the Consent Form,” “Step 5: Checking Your Car’s Power Supply,” “RESULT 1.” Photo. Power splitter with power light off. This photo shows the power splitter with a red circle around the power light, which is not illuminated (power is off).

Under “Completing the Consent Form,” “Step 5: Checking Your Car’s Power Supply,” “RESULT 2.” Photo. Power splitter with power light on. This photo shows the power splitter with a red circle around the power light, which is illuminated (power is on).

Under “Completing the Consent Form,” “Step 6: Setting up the Charger/Splitter,” Item 1. Photo. Splitter with USB charger plugged in. This photo shows the power light on, and the USB device is plugged into the USB power port, which is circled in red.

Under “Completing the Consent Form,” “Step 6: Setting up the Charger/Splitter,” Item 2. Photo. Mounted device with the power cable plugged in. This photo shows the mounted study device with the power cable plugged in, which is circled in red.

Under “Completing the Consent Form,” “Step 7: Turning on the Device,” Item 3. Photo. Location of power button on the study device. This photo shows the study device with an arrow labeled “Power button” superimposed indicating the location of the power button on the top corner of the device.

Under “Completing the Consent Form,” “Step 7: Turning on the Device.” Photo. Travel Time Application (ATT VMS) screen on device. This photo shows the splash screen of the ATT VMS Travel Time application. At the top of the screen “ATT VMS v3” appears. Below that is a gray triangular symbol.

Under “Completing the Consent Form,” “Step 7: Turning on the Device,” “IF YOU DO NOT SEE THE ATT VMS APPLICATION SCREEN.” Illustration. Android icon. This is an illustration of the Android icon.

Under “Study Calendar and Trip Log Schedule.” Screenshot. Calendar months for the period of December 2014 through February 2015. This screenshot shows how the calendar highlights the dates for participant activities, including equipment installation due dates, trip log due dates, and phase 1 and 2 start and end dates.

Federal Highway Administration | 1200 New Jersey Avenue, SE | Washington, DC 20590 | 202-366-4000
Turner-Fairbank Highway Research Center | 6300 Georgetown Pike | McLean, VA | 22101