What is a Dynamic Shoulder Lane? Consists of the use of the roadway shoulder as a general purpose lane only during periods of very high traffic congestion. The temporary use of the shoulder will provide an effective and economic alternative to relieve heavy traffic congestion. Shoulder utilization as a general use lane is restricted once more normal traffic flow conditions are established. How do you implement a Dynamic Shoulder? Effective dynamic shoulder implementation requires full integration with Intelligent Transportation System (ITS) technology. ITS will provide the technical infrastructure (traffic video, dynamic message signs, speed sensors, etc.) for implementation while supporting a platform for effective communication with the driving public. ITS is critical in the monitoring of traffic conditions, shoulder availability, and when high congestion begins to prevail, it will instruct the traveling public to begin using the shoulder. High operational speeds are not permitted on the shoulder. When high operational speeds are being detected, the traveling public will be advised to discontinue the use of the shoulder. Nationwide Applications: I-66 in Virginia The system allows the use of the right shoulder as travel lanes during designated peak traffic hours. Illustrations to follow. Shoulder is open on a scheduled basis. Monday – Friday only. Emergency pull off areas are provided next to the shoulder. Virginia DOT’s managed lane system is a cost effective and efficient way to increase capacity of the facility. A safety analysis presented no evidence that the managed lane approach during peak hours affects the crash frequency of the study area. Lessons learned: Enhanced dynamic message signs are essential, improve incident detection and quicken response time. I-66 Virginia I-66 Virginia I-66 Virginia I-66 Virginia Dynamic Shoulder Context Dynamic shoulder is a component of Active Traffic Management (ATM) technology. ATM seeks to effectively and efficiently use the existing transportation facility available capacity. ATM uses different applications – speed harmonization, queue warning, High Occupancy Vehicles, dynamic shoulders, dynamic signing and rerouting, among others. ATM Background ATM applications are well developed in Europe (Germany, England, Denmark, Netherlands). These countries use a combination of previously mentioned traffic strategies. Specific benefits derived from these applications: Increase in overall capacity. Decrease in the number of accidents. An overall harmonization of speeds during high congestion. Reduction in traffic delays. Germany - Frankfurt M42 - England M42 - England Transportation Benefits for I-75 Upgrading from 3-L to 4-L along I-75 only during peak hour congestion can reduce vehicle density per lane by 26% in peak hour conditions. Upgrading from 3-L to 4-L will increase service volume capacity by 34%. Overall, the service capacity of the interstate can be extended by several years at a much lower cost than traditional roadway widening. The inside shoulder was built with adequate strength under the “value added” benefit derived by the I-75 IROX Design Build type bidding. The dynamic shoulder ITS will be integrated with the existing active I-75 ITS. I-75 – Lee County I-75 – Lee County Conclusion Recommend implementation of Dynamic Shoulder Lanes along a 12- to 14-mile segment of I-75 (Lee County), pending FHWA coordination. Estimated cost per mile of Dynamic Shoulder Lanes: $1.5 $2.5 million. Cost of comparable traditional roadway expansion (6-L to 8-L) is approximately $5.5 - $6.5 million. The Dynamic Shoulder benefits would add 34% of additional capacity to the system. This will reduce heavy congestion, noise and contamination. FHWA is very supportive of these technological innovations as an effective solution to vehicular congestion. It has been successfully implemented domestically and abroad. QUESTIONS?