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A platform for research: civil engineering, architecture and urbanism
Capacity and safety analysis of hard-shoulder running (HSR). A motorway case study
Graphical abstract Display Omitted
Highlights The research addresses the HSR implementation in a motorway (A22) of the trans-European road network TEN-T. The flow parameters have been calculated (free-flow speed, jam density, capacity, reliability). We estimated the expected crash frequencies by means of Highway Safety Manual (HSM) methodology. Suggest a control programs of VSL (variable speed limit) for the motorway segments.
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 , and also suggested a speed limit sign system.
Capacity and safety analysis of hard-shoulder running (HSR). A motorway case study
Graphical abstract Display Omitted
Highlights The research addresses the HSR implementation in a motorway (A22) of the trans-European road network TEN-T. The flow parameters have been calculated (free-flow speed, jam density, capacity, reliability). We estimated the expected crash frequencies by means of Highway Safety Manual (HSM) methodology. Suggest a control programs of VSL (variable speed limit) for the motorway segments.
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 , and also suggested a speed limit sign system.
Capacity and safety analysis of hard-shoulder running (HSR). A motorway case study
Guerrieri, Marco (author) / Mauro, Raffaele (author)
Transportation Research Part A: Policy and Practice ; 92 ; 162-183
2016-08-02
22 pages
Article (Journal)
Electronic Resource
English
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