Dynamic Straight-Right Lane Design at T-Shaped Intersections: Concept, Control, and Evaluation
Publication: Journal of Urban Planning and Development
Volume 150, Issue 4
Abstract
In urban signalized intersections, because of the mixing of straight-going and right-turn vehicles in the straight-right shared lane, the straight traffic may block the rear right-turn vehicles from crossing the intersection during the red light, resulting in additional waiting time for right-turn vehicles. To address this problem, this study proposed the dynamic straight-right lane (DSRL) design and corresponding signal control schedule, which separates the straight-going and right-turn vehicles in space–time, making vehicles enter the intersection in an orderly manner. Then, the key parameters of the signal timing scheme were identified, and the physical significance of the key parameters of the optimal signal timing and the calculation models were given by discussing the optimal process of traffic flow operation at the signalized intersection. Finally, taking a realistic T-shaped signal intersection inlet lane as an example, the simulation verification platform was built by VISSIM to analyze the effects of variables on the performance of the DSRL proposed in this study. The results showed that the design proposed in this study can significantly reduce the right-turn vehicle delay without changing the overall layout of the signal intersection, and the total delay optimization rate at the intersection can always reach 10%–30%.
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Data Availability Statement
Data are available from the corresponding author upon reasonable request.
Acknowledgments
This work was supported in part by the Humanities and Social Science Fund of the Ministry of Education (Grant No. 23YJCZH120) and the National Innovation and Entrepreneurship Training Programme for University Students of China (No. 202310252023).
Author contributions: Shidong Liang: Study conception and Design; Huiyi Chu: Data collection; Wenxuan Xu: Data collection; Shidong Liang: Analysis and Interpretation of results; Huiyi Chu: Analysis and Interpretation of results; Wenxuan Xu: Analysis and Interpretation of results; Huiyi Chu: Draft manuscript preparation; Wenxuan Xu: Draft manuscript preparation. All authors reviewed the results and approved the final version of the manuscript.
Notation
The following symbols are used in this paper:
- a
- acceleration (m s−2);
- a0
- initial acceleration (m s−2);
- Cs
- single-lane capacity (vehicles h−1);
- Csr
- straight-right lane capacity (vehicles h−1);
- traditional intersection capacity (vehicles h−1);
- optimized intersection capacity (vehicles h−1);
- Csxi
- intersection capacity of Phase i (vehicles h−1);
- K
- traffic density (vehicles km−1);
- K1
- traffic density of the first vehicle in the DSRL (vehicles km−1);
- K2
- traffic density of the last vehicle in the DSRL (vehicles km−1);
- L
- length of the DSRL (m);
- L0
- initial length of the DSRL (m);
- n
- number of vehicles in the straight lane queued up to the stop line of the DSRL vehicle;
- Q
- traffic flow (vehicles h−1);
- Q0
- initial traffic flow (vehicles h−1);
- Q1
- traffic flow of the first vehicle in the DSRL (vehicles h−1);
- Q2
- traffic flow of the last vehicle in the DSRL (vehicles h−1);
- sa
- distance passes when the vehicle does uniform acceleration of linear motion (m);
- sb
- distance that the vehicle passes through in a linear motion at a constant speed (m);
- T
- time within a cycle (s);
- t
- time when the last vehicle that can pass at the end of Phase 4 passes from S3 to the stop line (s);
- time of the green phase in the straight lane of Phase i (s);
- time of the green phase in the straight-right lane of Phase i (s);
- ta
- time for the vehicle to make uniform acceleration in linear motion (s);
- tb
- time at which the vehicle does a constant speed linear motion (s);
- tc
- time elapsed from starting to passing the stop line at the inlet lane after the green light is on (s);
- td
- average time spent by a straight-going vehicle crossing a stop line (s);
- tj
- phase j duration (s);
- ts
- time of the green phase during the signal light cycle (s);
- v
- speed (km h−1);
- v0
- initial speed (km h−1);
- v1
- speed of the first vehicle in the DSRL (km h−1);
- vmax
- maximum vehicle speed (km h−1);
- vn
- speed of the last vehicle in the DSRL (km h−1);
- W
- speed of traffic wave in the DSRL (m s−1);
- θr
- percentage of right-turn vehicles;
- λ
- split; and
- φ
- reduction factor.
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© 2024 American Society of Civil Engineers.
History
Received: Dec 19, 2023
Accepted: Jun 18, 2024
Published online: Aug 22, 2024
Published in print: Dec 1, 2024
Discussion open until: Jan 22, 2025
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