01744685

Component

https://doi.org/10.1177/0361198120926454

Link cost function and link capacity are critical factors in traffic assignment modeling. Popular link cost functions like the Bureau of Public Roads (BPR) function have well-known drawbacks and are not suitable for mixed traffic conditions where a variety of vehicle classes use the road in a non-lane-based movement. Similarly, capacity is generally considered as a constant value. However, in mixed traffic conditions, capacity is not constant, but a function of vehicle class composition. Toward addressing these issues, this paper proposes a link cost function in relation to link travel time and link capacity in relation to vehicular traffic flow for mixed traffic conditions. The functions are developed based on the kinematic wave model, which is popularly used for estimating traffic dynamics on the roads. The developed link cost function and link capacity use field measurable parameters that incorporate mixed traffic features. The functions are validated against empirical data obtained from 12 signal cycles from two different signalized intersections in Chennai, India, representing different scenarios of mixed traffic, and it was found that the results match well with the empirical data.

© National Academy of Sciences: Transportation Research Board 2020.

English

pp 38-50

2020-9

Transportation Research Record: Journal of the Transportation Research Board

Web

References (26)

Costs; Functions (Mathematics); Highway capacity; Network links; Signalized intersections; Traffic assignment; Traffic flow; Travel time; Vehicle mix

Chennai (India)

Highways; Operations and Traffic Management

TRIS, TRB, ATRI

Jun 26 2020 3:06PM