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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 Construct Indirect Lefts US 29 SB to Vint Hill Road and Vint Hill Road to US 29 SB This alternative combination would eliminate the northbound and southbound queues at the Vint Hill Road intersection. Eliminating the northbound queue should significantly reduce the rear-end collisions on US 29 northbound. This alternative combination would include closing the existing median opening at the Vint Hill Road intersection. Closing the median should prevent traffic from slowing down and stopping in the left through lanes and eliminate the crashes (six crashes from 2005-2007) involving US 29 northbound left-turns and US 29 southbound traffic. Traffic operations were evaluated at the median cross-over where US 29 southbound traffic would U-turn in this alternative. Based on the modeled southbound 95% queue length of 229 feet (AM peak hour) and about 1100 feet of sight distance, about 830 feet of stopping sight distance will be available for US 29 northbound traffic – which is more than the required stopping sight distance for even 70 mph traffic. Traffic operations were evaluated at the median cross-over where US 29 northbound traffic would U-turn in this alternative. Based on the modeled northbound 95% queue length of 268 feet (PM peak hour) and about 800 feet of sight distance, about 530 feet of stopping sight distance will be available for US 29 southbound traffic – which is about 35 feet more than the required stopping sight distance for 55 mph traffic. A concern with the operations of this alternative combination is the short distance (500 feet) in which traffic from Vint Hill Road would need to cross two lanes of US 29 northbound traffic to access the left-turn lane in order to U-turn on to US 29 southbound. This limited distance raises the following concerns: • Drivers will lead to drivers waiting for a gap in traffic in both lanes of US 29 northbound, before they turn right off of Vint Hill Road. The traffic models for this study do not reflect the increased delay that would result from this driver behavior. • Drivers will aggressively change lanes in order to access the left turn lane which may lead to side-swipe crashes and fixed object crashes. • Drivers may travel very slowly (or stop) in the right through lane of US 29 northbound to access a gap in the left through lane traffic, which may lead to rear-end crashes. We have identified two options to address the concerns regarding the short distance between Vint Hill Road and the median U-turn location. 1. Use the existing left-turn / through lane of Vint Hill Road for traffic wanting to access US 29 southbound. This option has the following issues: a. Drivers familiar with the intersection may still utilize the right-turn lane in order to decrease their delays. b. Drivers in the channelized right-turn lane would need to watch for vehicles turning right from the “left-turn” lane as well as for gaps in US 29 northbound traffic. c. The configuration would likely be confusing to some drivers. 2. Use the second median opening north of Vint Hill Road instead of the first median opening for the indirect left U-turn location. This option has the following issues: a. A left-turn lane would need to be constructed on US 29 northbound at the second median opening. b. Some drivers will still attempt to use the first median opening, unless the first median opening is closed. Closing the first median opening may be perceived as affecting access to some of the properties on US 29. c. Sight distances would need to be verified at this intersection location. d. Traffic from Vint Hill Road to US 29 southbound would experience an increased travel time delay. Page 18 of 21 Over a Century of Engineering Excellence

US 29 / 15 Lee Highway & Route 215 Vint Hill Road DRAFT Evaluation & Recommendations Utilizing indirect lefts for US 29 southbound to Vint Hill Road traffic and for Vint Hill Road to US 29 southbound traffic addresses 72 of the 97 crashes reported from 2005-2007. Rerouting the US 29 southbound to Vint Hill Road left turns from the Vint Hill Road intersection, to U-turn at the existing median cross-over does not create any apparent operational or safety concerns at the cross-over. However, re-routing the Vint Hill Road to US 29 southbound left turns does create some operational and safety concerns. Therefore, this alternative could significantly improve the operational safety of the intersection, but could also create new operational and safety issues. Construct Indirect Lefts US 29 SB to Vint Hill Road, Vint Hill Road to US 29 SB, and Acceleration Lane This alternative combination would eliminate the northbound and southbound queues at the Vint Hill Road intersection. Eliminating the northbound queue should significantly reduce the rear-end collisions on US 29 northbound. Adding an acceleration lane on US 29 northbound allows a free flow right-turn movement from Vint Hill Road to US 29 northbound. In comparison with the two indirect left-turns without the acceleration lane, installing the acceleration lane on US 29 northbound: • eliminates the queuing of right turn traffic on Vint Hill Road; • slightly improves the total network delay; • provides a defined entry location for traffic from Vint Hill Road that should be clearly visible to US 29 northbound traffic; • generates possible weave concerns between traffic from Vint Hill Road and traffic accessing the commercial properties on US 29 northbound; and • increases weave concerns for Vint Hill Road to US 29 southbound traffic accessing the median U-turn; • addresses the same crash concerns. Construct US 29 SB Dual Lefts, Indirect Left Vint Hill Road to US 29 SB, and Acceleration Lane This alternative would reduce the northbound queue from about 611 feet to about 180 feet during the AM peak hour which has a longer queue than the PM peak hour. This reduced queue length would provide adequate stopping sight distance for 55 mph traffic on US 29 northbound. Providing adequate stopping sight distance to the back of the queue should significantly reduce the rear-end collisions on US 29 northbound. This alternative combination would have the same issues regarding the indirect left turn movement for Vint Hill Road to US 29 southbound traffic as previously described in the alternative combination “Indirect Lefts US 29 SB to Vint Hill Road, Vint Hill Road to US 29 SB, and Acceleration Lane”. Utilizing dual lefts for US 29 southbound to Vint Hill Road traffic, indirect lefts for Vint Hill Road to US 29 southbound traffic, and an acceleration lane on US 29 northbound for right-turn traffic from Vint Hill Road addresses 72 of the 97 crashes reported from 2005-2007. Re-routing the Vint Hill Road to US 29 southbound left turns creates some operational and safety concerns, which would be exacerbated by the right-turn acceleration lane. Therefore, this alternative could significantly improve the operational safety of the intersection, but could also create new operational and safety issues. Page 19 of 21 Over a Century of Engineering Excellence

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