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Virginia department of transportation traffic - Fauquier County

Virginia department of transportation traffic - Fauquier County

US 29 / 15 Lee Highway &

US 29 / 15 Lee Highway & Route 215 Vint Hill Road DRAFT Evaluation & Recommendations An additional potential benefit of signalizing the right-turn movement from Vint Hill Road is that the signal mast arm and heads would help to identify the right-turn location to approaching US 29 northbound traffic. Planning level cost estimate: $20,000 - $40,000 8. Change the flashing beacons and signal ahead signs to Signal Red Ahead signs. The existing flashing beacons and signal ahead signs only indicate that there is a signal ahead. The flashers currently operate continuously which does not aid the driver in determining what traffic conditions to expect. Changing the flashers and signs to Signal Red Ahead signs that incorporate a single line, red LED message (“RED”) in to the sign would still provide the continuous notice about the signal ahead, but also add the information that the signal is red (or will be by the time they arrive). The Signal Red Ahead signs would better indicate to a driver the need to slow down and anticipate stopped vehicles over the crest of the hill approaching the intersection. The “RED” portion of the sign could be set to turn on when the signal would turn red by the time drivers reach the intersection – which should reduce red light running and associated crashes (six crashes). The “RED” portion of the sign could also be set to remain on for a few seconds after the signal has actually changed to allow time for the stopped vehicle queue to start clearing the intersection – which should help to reduce the number or severity of rear-end collisions associated with the signal queue on US 29 northbound. Planning level cost estimate: Less than $20,000 9. Change the flashing beacons to indicate the signal ahead is changing or red. An alternative to Signal Red Ahead signs would be to install static signs indicating that the pair of flashers will flash together when the signal ahead is red and alternate when the signal will be red by the time a driver would reach the intersection. The potential benefits would be similar to those for the Signal Red Ahead mitigation measure. This approach would utilize static signs and amber flashers which are more commonly available than the Signal Red Ahead signs in terms of maintenance parts. The static signs and flashers would require more perception and interpretation time for a driver than the Signal Red Ahead signs. Planning level cost estimate: Less than $20,000 10. Install Queue length detectors along US 29 northbound that can trigger DMS’s to display approximate distance to stopped vehicles. Installing detectors along US 29 northbound between the crest of the hill and the signal would allow the extent of the traffic queue to be reported to approaching drivers via dynamic message signs. The signs could be full matrix, line matrix, or adapted warning signs. The adapted warning signs could be much like the Signal Red Ahead signs, but instead read “Stopped Traffic ### Feet Ahead”. In this configuration the ### would be the dynamic display that would indicate the distance portion of the message. The queue detectors should cover the area between the signal and the hillcrest approaching the signal. Providing a driver with the distance to stopped vehicles should allow drivers to adjust their speed more appropriately than the current limited vertical sight distance allows, thereby reducing the number and severity of rear-end collisions associated with the signal queue on US 29 northbound. See Figure Mitigation Measure 10 for a conceptual layout of this measure. Planning level cost estimate: $150,000 - $400,000 Page 8 of 21 Over a Century of Engineering Excellence

US 29 / 15 Lee Highway & Route 215 Vint Hill Road DRAFT Evaluation & Recommendations 11. Install a traffic camera and full matrix, color dynamic message sign to display roadway conditions to approaching traffic where the crest curve currently limits sight distance. Installing a camera that looks towards the signalized intersection from before the hillcrest and displaying the video image on a full matrix, color, LED dynamic message sign in real time would provide drivers with a view over the hill of the road ahead. The image may need to include some visual reference markers (perhaps the DMS and sign structure) to aid the driver in determining relative distance. Providing a view of the road over the hill should allow drivers to react to road conditions as they would normally where there are no sight distance limitations. (The projected video image would require almost no perception and interpretation time for a driver.) This measure has the potential to significantly reduce the number and severity of the rear-end collisions along US 29 northbound and reduce the number of red light running instances. For the camera to operate properly and provide a useful image at night, it may be necessary to install roadway lighting along US 29 in the camera’s field of view. Planning level cost estimate: $150,000 - $400,000 12. Reduce the speed limit for US 29 northbound approaching the intersection of Vint Hill Road. This may be through advisory (warning) sign panels or regulatory signing. While the primary focus of this study is the immediate vicinity of the US 29 and Vint Hill Road intersection we have identified that on US 29 northbound there is a series of four crest vertical curves and four sag curves that are substandard for the posted 55 mph speed limit. Most of these vertical curves only meet a 30-35 mph design speed. These curves comprise nearly all of the vertical alignment from about 4000 feet south to about 350 feet north of Vint Hill Road. Given these vertical alignment constraints reducing the speed limit or providing warning signs regarding speed should be considered. Reducing the speed of vehicles should reduce the number and severity of the rear-end collisions along US 29 northbound and reduce the number of red light running instances. Planning level cost estimate: Less than $20,000 13. Re-grade a portion of the hill between the left turn and right turn lanes from Vint Hill Road. This would allow the right turn lane and traffic to be visible to US 29 northbound traffic. During our field review we noted that the abrupt hill between the left turn traffic and right turn traffic from Vint Hill Road obscures the right turn lane pavement (and to some extent vehicles using the right turn lane from Vint Hill Road) from the view of US 29 northbound traffic. When US 29 northbound traffic is passing through the intersection (and able to see past hill described), suddenly the right turn lane from Vint Hill Road appears. Re-grading a portion of the hill between the left and right turn lanes of Vint Hill Road would provide better visibility of the right turn traffic to the US 29 northbound through traffic. This could reduce the crashes of US 29 through traffic after they have passed through the main portion of the intersection. See Figure Mitigation Measure 13 for a depiction of the area impacted by this measure. Planning level cost estimate: $20,000 - $50,000 14. Re-grade a portion of the US 29 median to provide adequate sight distance for permitted left turns from US 29 southbound to Vint Hill Road. Re-grading a portion of the median to provide adequate sight distance for permitted left turns from US 29 southbound to Vint Hill Road would allow some of these left turns to clear the intersection during the through traffic phase of the signal. This could result in less green time required for the left turn movement and therefore more green time for the through traffic movements. See Figure Mitigation Measure 14 for a depiction of the area impacted by this measure. Page 9 of 21 Over a Century of Engineering Excellence

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