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Part-time shoulder use effects on safety: a vissim-based case study in southeast Pennsylvania
Villanova University.
Villanova University.
2018 (English)Conference paper, Poster (with or without abstract) (Refereed)
Abstract [en]

The safety performance of United States of America (U.S.A.) roadways has been relatively stagnant over the last eight years for injury-related crash rates, remaining in the mid-70s for injury rate per 100 million vehicle miles traveled, and slightly down for fatality-related crashes rates, a decrease of 0.07 fatalities per 100 million vehicles miles traveled (US Department of Transportation (USDOT) 2016 and National Highway Traffic Safety Administration (NHTSA). The overall focus in major metropolitan areas is improving the operations as travel volumes continue to increase on the major highways surrounding these metropolitan areas. With every new operational strategy, the safety effects are typically analyzed to ensure the roadway safety is, at least, negligibly affected. Part-time shoulder use (PTSU) is an operations improvement strategy that has mixed expectations from transportation agencies on its effects on safety. PTSU utilizes the shoulder as an additional lane during high congestion periods, typically during commuting time where there are high levels of congestion, typically around metropolitan areas. As the use of this strategy is still growing, the majority research on the safety effects are theoretical or field case-studies. In high population density areas, as roadway expansion becomes increasingly difficult, optimizing the current roadway infrastructure will become a more significant focus of maintaining the roadway system. PTSU is one of the major strategies that can significantly improve the operations of these roadway and additional knowledge of PTSU is needed for improved applications in the future. In the implementations that have occurred around the world, the safety effects have been negligible to partially beneficial. There is still an overall concern as there is a loss of the emergency travel lane or an emergency refuge area if a vehicle breaks down. Typical PTSU implementations recommend periodic refuge areas for broken down vehicles. This study aims to explore the extent of PTSU application effects on the roadway safety, including cases when there is a partially blocked lane due to an incident. This study is focusing on a microsimulation methodology to evaluate PTSU on a roadway in Southeastern Pennsylvania that is expected to utilize PTSU in the future according to the Delaware Valley Regional Planning Commission (DVRPC) 2040 plan (DVRPC 2013). The final aim is to further understand PTSU in the U.S. to improve future application of this operational strategy.

Place, publisher, year, edition, pages
Linköping: Statens väg- och transportforskningsinstitut, 2018.
National Category
Transport Systems and Logistics
Research subject
X RSXC
Identifiers
URN: urn:nbn:se:vti:diva-12951OAI: oai:DiVA.org:vti-12951DiVA, id: diva2:1204541
Conference
18th International Conference Road Safety on Five Continents (RS5C 2018), Jeju Island, South Korea, May 16-18, 2018
Available from: 2018-05-16 Created: 2018-05-08 Last updated: 2018-05-25Bibliographically approved

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Transport Systems and Logistics

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CiteExportLink to record
Permanent link

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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
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