A New Lost Time Estimation Method for Right-Turn Traffic in Japan Considering Signal Phasing and Sneakers

This article presents a lost time estimation method for right-turn traffic in Japan (comparable to left-turn traffic in the USA), a strategy that can be used to determine optimal signal phasing schemes at signalized intersections. The authors first present a relevant literature review and then introduce their method, incorporating three conventional signal phasing plans in use in Japan. They then validate the method using field data and a series of case studies from seven intersections in Japan (3 from Tokyo and 4 from Nagoya). The vast majority of vehicles were passenger cars and small trucks; pedestrian volumes were quite small at the intersections under consideration. Sneakers are defined as drivers who complete left turns during the effective red portion of the clearance-and-change interval at the end of a permitted phase. Lost times of right-turn traffic under three conventional phasing plans are theoretically formulated on the basis of a time–space diagram and shock-wave theory. The authors conclude that their proposed method offers a more accurate estimation than conventional approaches, resulting in shorter cycle length and a simplified signal timing process.

Language

  • English

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  • Accession Number: 01541841
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Oct 27 2014 9:27AM