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Title:

Optimizing Isolated Traffic Signal Timing Considering Energy and Environmental Impacts

Accession Number:

01590554

Record Type:

Component

Abstract:

Traffic signal cycle lengths are typically computed to minimize the intersection vehicle delay using the Webster formula. The objectives of this study are two-fold. First, it validates the Webster formula against simulated data. Second, it develops new formulations to compute the optimum cycle length considering other measures of effectiveness including vehicle fuel consumption levels and tailpipe emissions. The microscopic simulation software, INTEGRATION, is used to simulate a two-phase intersection over a range of cycle lengths, traffic demand levels, and signal timing lost times. Intersection delay, fuel consumption levels, and hydrocarbon (HC), carbon monoxide (CO), oxides of nitrogen (NOx), and carbon dioxide (CO₂) emissions were derived from the simulation model. The cycle lengths that minimized the various measures of effectiveness were then used to develop the proposed models. The first effort entailed re-calibrating the Webster model to the simulated data. The second effort entailed enhancing the Webster model by incorporating an additional intercept term. The proposed model is demonstrated to produce better traffic signal timings and is calibrated to minimize delay, fuel consumption and CO₂ emission levels. The model estimates produce shorter cycle lengths when compared to the Webster model and also considers fuel consumption and Green House Gas (GHG) emissions in the optimization procedure.

Supplemental Notes:

This paper was sponsored by TRB committee AHB25 Standing Committee on Traffic Signal Systems.

Monograph Accession #:

01584066

Report/Paper Numbers:

16-1092

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Laguna, Alvaro J Calle
Rakha, Hesham A
Du, Jianhe

Pagination:

20p

Publication Date:

2016

Conference:

Transportation Research Board 95th Annual Meeting

Location: Washington DC, United States
Date: 2016-1-10 to 2016-1-14
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

Figures; References; Tables

Subject Areas:

Energy; Environment; Highways; Operations and Traffic Management; I15: Environment; I73: Traffic Control

Source Data:

Transportation Research Board Annual Meeting 2016 Paper #16-1092

Files:

TRIS, TRB, ATRI

Created Date:

Jan 12 2016 4:29PM