Journal
JOURNAL OF TRANSPORTATION SAFETY & SECURITY
Volume 12, Issue 3, Pages 419-440Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/19439962.2018.1490368
Keywords
Right-turn treatments; traffic conflict model; signalized intersection; full Bayesian estimation
Categories
Funding
- National Natural Science Foundation of China [51322810, 51925801, 71701046]
- China Postdoctoral Science Foundation [2018T110427, 2017M571644]
- Fundamental Research Funds for the Central Universities [2242018R20003, YBJJ1533]
- Scientific Innovation Research of College Graduates in Jiangsu Province [KYLX_0173]
- EPSRC [EP/N010612/1] Funding Source: UKRI
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The primary objective of the study is to evaluate the impacts of right-turn treatments on right-turn-on-red (RTOR) conflicts at signalized intersections. Data were collected at 20 signalized intersections in Kunming, China. Three thousand, seven hundred and forty-six RTOR conflicts from five types of right-turn treatments were identified for analysis. Traffic conflict rates were compared among different types of right-turn treatments. The results showed that type 4 right-turn treatment (with raised channelized island and acceleration lane on the cross-street) has the lowest conflict rate, followed by the type 2 right-turn treatment (with painted channelized island and acceleration lane on the cross-street). Traffic conflict models were developed to investigate factors related to the RTOR conflicts frequency using full Bayesian estimation. Three types of models were developed and compared, including the fixed-parameter, the random-effect, and the random-parameter conflict models. The results showed that the random-parameter model outperformed the fixed-parameter model and the random-effect model. Further results from the traffic conflict model showed that the conflicting traffic volume, right-turn treatment type, right-turn radius and yield control sign for right-turn movement significantly affect the RTOR conflicts frequency. The elasticity results showed that the conflict frequency can be reduced by 15.03%, 28.4%, 18.53%, and 23.37% by type 1, type 2, type 3, and type 4 right-turn treatments, respectively.
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