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Capacity and safety analysis of hard-shoulder running (HSR). A motorway case study

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  • Guerrieri, Marco
  • Mauro, Raffaele

Abstract

Operational motorway conditions can be improved by introducing traffic flow management and control systems, such as ramp metering (RM), high occupancy vehicle (HOV) lanes, real-time variable speed limits (VSLs), reversible lanes (RL), automated highway systems (AHS) and hard-shoulder running (HSR). The effects of such devices need to be examined in terms of capacity and safety. This paper examines the case study of the Italian motorway A22, which is supposed to be equipped with an HSR system implemented along 128km in order to reduce congestion with consequent improvement in levels of service (LOS). We studied the traffic processes (capacity, flow distribution between lanes, reliability, etc.) and estimated the expected capacity and safety conditions. These latter were studied with the method provided by the Highway Safety Manual (HSM), as well as by undertaking sensitivity analyses to quantify the expected changes in crash frequency at varying HSR activation hours (from 30 to 200h) in a year. It has been observed that HSR activation does not involve significant variations in the general safety conditions in the presence of a considerable capacity increase up to 35%. Moreover, have been identified the cases which require speed limit implementation (with VSLs system) in function of the values of reliability ϕ and velocity process V‾, and also suggested a speed limit sign system.

Suggested Citation

  • Guerrieri, Marco & Mauro, Raffaele, 2016. "Capacity and safety analysis of hard-shoulder running (HSR). A motorway case study," Transportation Research Part A: Policy and Practice, Elsevier, vol. 92(C), pages 162-183.
    • Handle: RePEc:eee:transa:v:92:y:2016:i:c:p:162-183
    DOI: 10.1016/j.tra.2016.08.003
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    References listed on IDEAS

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    1. Wang, Chen & David, Bertrand & Chalon, René & Yin, Chuantao, 2016. "Dynamic road lane management study," Transportation Research Part E: Logistics and Transportation Review, Elsevier, vol. 89(C), pages 272-287.
    2. Ferrari, Paolo, 1988. "The reliability of the motorway transport system," Transportation Research Part B: Methodological, Elsevier, vol. 22(4), pages 291-310, August.
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    Cited by:

    1. Ma, Xiaobo & Karimpour, Abolfazl & Wu, Yao-Jan, 2020. "Statistical evaluation of data requirement for ramp metering performance assessment," Transportation Research Part A: Policy and Practice, Elsevier, vol. 141(C), pages 248-261.
    2. Fan Yang & Fan Wang & Fan Ding & Huachun Tan & Bin Ran, 2021. "Identify Optimal Traffic Condition and Speed Limit for Hard Shoulder Running Strategy," Sustainability, MDPI, vol. 13(4), pages 1-17, February.

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