Exploring multiplier effects generated by combining transit signal priority with dedicated bus lanes or queue jump lanes on arterials

Prioritising Public Transport (PT) vehicles is essential to enhancing the performance of PT systems. There has been an extensive body of literature dealing with the design and operation of PT priority measures. However, it remains unclear whether providing Transit Signal Priority with Dedicated Bus Lanes (TSPwDBL) or Transit Signal Priority with Queue Jump Lanes (TSPwQJL) at multiple intersections creates a multiplier effect on PT benefits, i.e. the benefit from providing priority together at multiple intersections is greater than the sum of benefits from providing priority separately at each of those individual intersections. From a policy perspective, the existence of a multiplier effect would indicate considerable benefits through providing both time and space priority in combination on a corridor-wide scale. This paper therefore explores the effects of providing TSPwDBL or TSPwQJL at multiple intersections on bus delay savings and person delay savings. Simulation results reveal that providing TSPwDBL or TSPwQJL at multiple intersections can create a multiplier effect on bus delay savings. In general, the multiplier effect results in a 5-8% improvement in one-directional bus delay savings for each additional intersection with TSPwDBL or TSPwQJL, when signal offsets provide bus progression for that direction. An explanation for the multiplier effect is that TSPwDBL and TSPwQJL reduce variations in bus travel times and thus enable signal offsets, which account for bus progression, to perform even better. Furthermore, simulation results show limited evidence of a multiplier effect on person delay savings, particularly for TSPwQJL, with offsets optimised for person delay savings.

Language

  • English

Media Info

  • Pagination: 16p
  • Monograph Title: 38th Australasian Transport Research Forum (ATRF 2016), Melbourne, 16th - 18th November 2016

Subject/Index Terms

Filing Info

  • Accession Number: 01627380
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ITRD, ATRI
  • Created Date: Feb 27 2017 10:03AM