Effects of Provision of Passing Lanes in Opposing Two-lane Roads

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  • 二車線道路における追越車線設置効果に関する基礎的研究
  • ニシャセン ドウロ ニ オケル オイコシシャセン セッチ コウカ ニ カンスル キソテキ ケンキュウ

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Abstract

In this study, a model that estimates the benefits brought by provision of a passing lane in opposing two-lane roads was proposed. The model does not depend on a Monte Carlo simulation technique, so the benefits can be analytically calculated. The model requires the distribution of velocities of a platoon of vehicles after provision of the passing lane for calculating the benefits. The distribution of vehicle velocities can be easily obtained by observing real traffic situations along a road that has a similar traffic situation as the road of interest. The distribution of velocities assumed in this study was a Gumbel distribution. The proposed model calculates the velocity differences, i.e. increase in average velocity, with provision of the passing lane. Benefits, such as those from travel time reduction and travel cost reduction, can be estimated by the velocity differences. The proposed model can be combined with network analysis models, e.g. deterministic user equilibrium model or stochasitic user equilibrium model. Benefits from provision of the passing lane in the road network can also be estimated by the proposed model if combined with a road network analysis model. Therefore, the benefits calculated by the proposed model can reflect the route choice behaviors of drivers. A numerical experiment using a small road network was carried out to demonstrate the model. The road network had one origin-destination pair and two parallel routes in which it was assumed that one consisted of a one-lane road and the other a multi-lane road. Provision of the passing lane was then made to the route with the one-lane road. The drivers in the road network were assumed to change their route choice behaviors by using agerage travel they experience. The road network model applied to the numerical experiments was a deterministic user equilibirium model. Benefits due to travel time reduction in the network was correctly calculated by considering the route choice behaviors of the drivers. In addition, the benefit can be overestimated if the network analysis model is not applied because route choice behaviors play an important role in the calculations of the benefits.<br><br>JEL Classification: C69

Journal

  • Studies in Regional Science

    Studies in Regional Science 41 (4), 1003-1016, 2011

    JAPAN SECTION OF THE REGIONAL SCIENCE ASSOCIATION INTERNATIONAL

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