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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 From our field observations US 29 southbound left-turn traffic can pull into the median to obtain about 495 feet of intersection sight distance, which meets the 490 feet required for a 60 mph design speed per Exhibit 9-76 in the AASHTO Green Book. Planning level cost estimate: $150,000 - $500,000 15. Widen the pavement of Vint Hill Road to provide a wider left turn / through lane. Widening the left turn / through lane on Vint Hill Road could potentially address the side swipe and fixed object crashes on this approach to the intersection. See Figure Mitigation Measure 15 for a depiction of the area impacted by this measure. Planning level cost estimate: $50,000 - $150,000 Concept Alternatives Concept alternatives are things that can be done to improve the safety and operations of the roadway and intersection that include changes to the roadway. Some of the concept alternatives can be combined with one or more other concept alternatives and one or more mitigation measures. In general, concept alternatives are expected to be more expensive and take longer to implement than mitigation measures. The concept alternatives identified for this intersection are listed and described below. 1. Construct a left turn lane on US 29 northbound at Vint Hill Road. Constructing a left turn lane for US 29 northbound at the Vint Hill Road intersection would eliminate the need for left turn and U-turn traffic slow down or stop in the left through lane. This should reduce the number of crashes in the left lane and should also reduce the six crashes between US 29 northbound left turns and US 29 southbound traffic. See Figure Concept Alternative 1 for a depiction of this alternative. The volume of left turn and (currently prohibited) U-turn traffic does not meet the guidelines from the VDOT Road Design Manual for left turn lanes. Planning level cost estimate: $150,000 - $250,000 2. Modify the ends of the unpaved median and / or construct an island in the median of the intersection to block left turns and U-turns from US 29 northbound. Modifying the ends of the unpaved median and / or constructing an island in the median of the intersection to physically block US 29 northbound left turns and U-turns would reduce the number of crashes in the left lane and should eliminate the six crashes between US 29 northbound left turns and US 29 southbound traffic. Unless some additional movements are eliminated at the intersection, the amount of median modification that can be accomplished is extremely limited and no island can be constructed in the median of the intersection. If through movements are eliminated from Vint Hill Road and the opposing commercial driveway, then some median reconfiguration could be achieved with an island in the median of the intersection. Since the traffic volume for the through movements from Vint Hill Road and the commercial driveway are quite low (See table below) eliminating them may be feasible. Through Traffic Volumes AM Peak Hour PM Peak Hour 12-Hour Total Vint Hill (WB) 1 1 8 Commercial Drive (EB) 0 0 15 Planning level cost estimate: $50,000 - $100,000 Page 10 of 21 Over a Century of Engineering Excellence

US 29 / 15 Lee Highway & Route 215 Vint Hill Road DRAFT Evaluation & Recommendations 3. Construct an acceleration / merge lane on US 29 northbound for right turn traffic from Vint Hill Road. Constructing an acceleration / merge lane on US 29 northbound for right turn traffic from Vint Hill Road would allow the right turns to be a continuous flow movement. Since the signal timing is currently affected by the detector on the right turn movement the acceleration lane would allow more green time to be provided for US 29 through traffic. Constructing the acceleration lane would also eliminate the operational concerns about some drivers running the stop sign when they see that US 29 traffic is stopped. The acceleration lane should extend north 500 to 1200 feet based on Simtraffic models and AASTHTO standards. There are a series of commercial entrances that start about 600 feet north of Vint Hill Road, so our preliminary layout of the acceleration lane assumes that the acceleration lane would become a right turn only lane into these entrances. Weaving and speed differential concerns arise with the acceleration lane being shared as a right turn lane into the commercial properties. This issue will require further analysis during design. See Figure Concept Alternative 3 for a depiction of this alternative. Planning level cost estimate: $150,000 - $300,000 4. Utilize indirect lefts for Vint Hill Road to US 29 southbound left turns. Reconfiguring the intersection to utilize indirect left turns for Vint Hill Road to US 29 southbound traffic would reduce the volume of traffic conflicting with US 29 through traffic, thereby allowing more of the signal green time to be allotted to US 29 through traffic. A signal would be installed at the existing median opening located about 900 feet north of Vint Hill Road. This median opening already has a left turn lane US 29 northbound traffic, so construction costs can be minimized. US 29 northbound stopping sight distance at this location is about 700 feet and southbound stopping sight distance is greater than 800 feet. The southbound sight distance is more relevant since it will be stopped by the signal at this location. See Figure Concept Alternative 4 for a depiction of this alternative. Utilizing indirect lefts for Vint Hill Road to US 29 southbound traffic could eliminate a phase from the signal, but does not necessarily do so. Through traffic to and from the commercial driveway along with left turn traffic from the driveway could utilize the signal phase or be re-routed to make the driveway a right in – right out which would eliminate the signal phase. A concern with converting the driveway to a right in – right out is that the driveway serves a business that necessitates trucks with trailers which would be re-routed to U-turns along US 29. This concern is heightened since many of the U-turns would be at unsignalized median openings. Planning level cost estimate: $150,000 - $200,000 5. Utilize indirect lefts for US 29 southbound to Vint Hill Road. Reconfiguring the intersection to utilize indirect left turns for US 29 southbound to Vint Hill traffic would reduce the volume of traffic conflicting with US 29 through traffic, thereby allowing more of the signal green time to be allotted to US 29 through traffic. A signal would be installed at the existing median opening located about 1200 feet south of Vint Hill Road. A left-turn lane would be constructed for US 29 southbound traffic. US 29 northbound stopping sight distance at this location is about 1100 feet and southbound stopping sight distance is greater than 800 feet. The northbound sight distance is more relevant since it will be stopped by the signal at this location. See Figure Concept Alternative 5 for a depiction of this alternative. The effects of the existing left-turn lane for US 29 northbound traffic have not been considered since we have no traffic counts for this location. However it seems likely that the volumes will be quite low with the possible exception of some U-turn traffic from the church and the impacts would mostly affect US 29 southbound does not have the sight distance limitations that US 29 northbound does. Therefore, the effects of leaving the existing left turn lane in use should be minimal and acceptable. Page 11 of 21 Over a Century of Engineering Excellence

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