Temporary Shoulder Use TEMPORARY SHOULDER USE

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Temporary Shoulder Use TEMPORARY SHOULDER USE Traffic Management Active Traffic Management Temporary Shoulder Use TEMPORARY SHOULDER USE Description Temporary shoulder use, also known as hard shoulder running, is a dynamic measure designed to adapt roadway capacity to high traffic volumes on a temporary basis. By allowing vehicles (either all vehicles or only transit vehicles) on the shoulder using reduced speed limits, it is possible to serve a higher number of people and vehicles and avoid congestion, either totally or partially, during peak periods. The decision to implement shoulder use on a segment is taken Virginia DOT by the operator in the traffic management center based on operating policies and volume Cost: considerations after a check for obstacles. Time: Moderate Two approaches to temporary shoulder use are: Impact: Corridor . Shoulder use for all vehicles – allows all Who: State vehicles on the roadway to utilize the Hurdles: Right-of-Way, designated shoulder when open. Traffic Public Support, control devices over or adjacent to the shoulder instruct drivers when driving Design, Operations on the shoulder is permitted. How Will This Help? . Transit-only shoulder use, also known as Temporary shoulder use can help postpone the a bus bypass shoulder (BBS) or bus on onset of congestion. By increasing capacity and shoulder (BOS) – allows only transit encouraging more uniform speeds, traffic flows vehicles to utilize the designated more smoothly and efficiently, which can shoulder in specific conditions and improve trip travel time reliability. driving regulations. The bus drivers are instructed to use the shoulder under Increased vehicle volume can be another benefit specific circumstance to ensure the of temporary shoulder use by temporarily safety of the operation and all the increasing capacity. freeway users. Transit service can become more reliable as buses are allowed to bypass congestion on Target Market primary route corridors. Freeways or roads experiencing frequent congestion. Implementation Examples The Netherlands implemented temporary right . Freeways servicing multiple high ridership bus routes that experience shoulder use in 2003 as part of a larger program significant travel time reliability to improve use of the existing infrastructure. The problems. strategy is utilized on more than 620 road miles across The Netherlands1 and only operates during time periods of congestion or when For more information, please refer to: http://mobility.tamu.edu/mip/strategies.php. incidents occur along instrumented roadways. generally low-cost and can be quickly Since 1996, Germany has deployed temporary implemented without expansion of right-of-way. shoulder use to provide additional capacity during congested operations. Operated on more Application Techniques and Principles than 120 miles of roadways across the country, it For temporary shoulder use for all vehicles, is only deployed in conjunction with variable facilities should have the following: speed limits when maximum allowable speeds . Considerable rush hour congestion. are 60 mph and if dynamic message signs are . A segment of significant length (about used for lane control.1 Temporary shoulder use three miles or more). in Great Britain is deployed as part of an overall . No regular bottleneck at the downstream operational Active Traffic Management (ATM) end of the shoulder use segment. scheme, and is only deployed in conjunction with variable speed limits and when speeds are . The need to move buses past a regular reduced (initially to 50 mph). bottleneck. Temporary shoulder use varies in the U.S. On . Low volumes entering and exiting the Massachusetts SR 3, IH 93, and IH 95 in the facility, especially if going through Boston area, all vehicles are permitted on interchanges. shoulders in the peak periods only. Similarly, in . Available right of way for emergency Virginia on IH 66, the shoulder carries general refuge areas and acceleration/ purpose traffic from 5:30 a.m. to 11:00 a.m. deceleration tapers. (eastbound) and 2:00 p.m. to 8:00 p.m. (westbound); however, during this time, the . Sufficient pavement strength on the interior general purpose lane is open to HOV shoulder to bear the traffic. traffic only. IH 66 uses extensive traffic signals Additionally, temporary shoulder use can also and signage in order to communicate the active benefit from active incident management times of service. In the Seattle area, the right programs, connection to a traffic monitoring shoulder on the US 2 trestle near Everett is open center serving as the focal point for the system, to all traffic in the eastbound direction during existing sensors and intelligent transportation the afternoon peak period. A similar operation is systems, and the presence of variable speed provided on H1 in Honolulu in the morning peak limits on the facility. on the right shoulder. A unique combination of For transit-only shoulder use, a facility should strategies is active on IH 35W in Minneapolis have: where a segment has the left shoulder open . Predictable congestion delays during the during the peak periods. Known as priced peak period. dynamic shoulder lanes (PDSL), transit buses and carpools use the shoulder for free and . A minimum 10-ft shoulder width MnPASS (automated toll payment program) available. customers can use the shoulder for a fee. Sufficient pavement strength to sustain Bus on shoulder programs operate on over bus load. 290 miles of freeways and major streets in the . A significant number of high ridership Minneapolis-St. Paul metropolitan area, and also buses per hour. operate in California, Delaware, Florida, Georgia, Illinois, Maryland, New Jersey, Virginia, and Furthermore, temporary shoulder use for transit Washington. This operational strategy is vehicles also benefits when travel time variability is higher than one minute per two For more information, please refer to: http://mobility.tamu.edu/mip/strategies.php. miles; when few conflict points exist at vehicles on an open shoulder. ERA interchanges; and when the facility segment provides refuge on the side of the under consideration services multiple high freeway. The figures below show an ridership bus routes. example from England where the ERAs are located approximately every half- The following are key factors to consider that mile. Operators detect vehicles in the can help facilitate successful deployment: refuge areas using video cameras and/or . Temporary shoulder use is typically vehicle detection technology. Each ERA implemented in conjunction with contains an emergency telephone linked variable speed limits. directly to a regional control center. When implemented with variable speed . Overhead guide signs should reflect the limits, speed limit signs and lane control current use of the roadway. In other signals need to be visible to all vehicles; words, when the shoulder is open to therefore, the signs should be placed on traffic, guide signs should provide gantries over every lane of traffic. During information to the shoulder lane as if it normal operation (when the use of the was a permanent travel lane. This can be shoulder is prohibited) all the signs— accomplished with dynamic message including the sign over the shoulder— signs. are blank. Either the left or the right shoulder can Issues be used for the application, depending on While successful in Europe for many years, the facility conditions. It is not temporary shoulder use in the U.S. has been recommended to apply shoulder use on limited and varies considerably. In the Boston both left and right shoulders of a facility area, all vehicles are permitted on shoulders in at the same time. the peak periods only, that is also the case in Virginia in the Washington, D.C., area. In the . Video cameras should be regularly Seattle area, the right shoulder on the US 2 spaced to allow operators to check for trestle near Everett is opened to all traffic in the obstacles before opening the shoulder to eastbound direction during the afternoon peak traffic and to monitor operations while period. A unique combination of strategies is shoulder use is permitted. Emergency operational on IH 35W in Minneapolis where a refuge areas (ERA) should be located at segment has the left shoulder open during the regular intervals along the shoulder with peak periods. Known as priced dynamic proper signing to avoid having stranded shoulder lanes (PDSL), transit buses and carpools use the shoulder for free and MnPASS (their automated toll payment program) customers can use the shoulder for a fee. England: Example of emergency refuge area2 England: Example of emergency refuge area sign2 For more information, please refer to: http://mobility.tamu.edu/mip/strategies.php. Who Is Responsible? Cost The local TxDOT office bears the responsibility The cost of implementing temporary shoulder of developing and maintaining variable speed use within a corridor varies considerably limits. This agency should determine the depending on the existing infrastructure and viability of and need for the strategy along with whether variable speed limits will be deployed the availability of right-of-way required for sign in conjunction with the shoulder use. As one installation at regular intervals for adequate example, a scanning/feasibility study on active visibility. It should also provide the adequate traffic management conducted for Washington infrastructure for the TMC and deployment State Department of Transportation (WSDOT) support for other devices. showed that shoulder use is an effective way to increase capacity and reduce congestion
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