01659911

Component

The goal of this paper is to optimize the location of dedicated bus lanes on an arterial accounting for queue spillbacks. A bi-level optimization similar to previous methods is used in this paper; however, previous methods on the network level were not capable of accounting for queue spillbacks. Queue spillbacks due to implementation of bus lanes are considered in the lower level algorithm, which evaluates travel times on the network for different bus lane locations. Additionally, signalized intersections are explicitly modeled in this paper, which has previously not been done. A link transmission model that can approximate kinematic wave theory of traffic is used to account for the signalized intersections and potential queue spillbacks at the lower level. Hence, the lower level of the algorithm represents real networks much more closely than previous work. The upper level algorithm then generates different locations of exclusive bus lanes and obtains the optimal location using a genetic algorithm. The proposed method is applied to a test network where all links with bus service are considered possible for bus lane implementation. The objective function of the genetic algorithm is to minimize passenger total travel time within the network and the private car delay at origin nodes caused by queue spillbacks. The proposed method is tested for both saturated and under-saturated traffic conditions. Results show that, the proposed methodology successfully accounts for the effects of queuing. For saturated conditions, increase in delay at origin nodes outweighs the benefits to buses; therefore, there are only two bus lane locations in the optimum solution. For under-saturated conditions, benefits of dedicated bus lanes are limited since the network is under-saturated and introduction of bus lanes do not significantly reduce bus travel times. Hence, optimum solution of under-saturated conditions has only six bus lanes.

This paper was sponsored by TRB committee ADB30 Standing Committee on Transportation Network Modeling. Alternate title: Optimization of Dedicated Bus Lane Infrastructure on Networks Accounting for Queue Spillbacks

18-01410

English

10p

2018

Transportation Research Board 97th Annual Meeting

Digital/other

Figures; References; Tables

Arterial highways; Bus lanes; Bus transit; Infrastructure; Networks; Optimization; Queuing

Highways; Operations and Traffic Management; Public Transportation

Transportation Research Board Annual Meeting 2018 Paper #18-01410

TRIS, TRB, ATRI

Jan 8 2018 10:21AM