Analysis of a Signalized Intersection with Dynamic Use of the Left-Turn Lane for Opposite through Traffic

Zheng, Yongtao; Hua, Xuedong; Wei, Wang; Xiao, Jialiang; Li, Dongya

doi:10.3390/su12187530

Cited by 11 publications

(7 citation statements)

References 33 publications

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“…A contraflow left-turn lane (CLL),one of unconventional intersections, provides additional left-turn capacity at intersections by dynamically using contraflow exit lanes [20][21][22][23]. As another unconventional intersection, the U-turn (UT) requires left turning vehicles to follow through vehicles crossing the intersection and U-turn at the downstream opening to achieve indirect left turning [24,25].…”

Section: Unconventional Intersectionsmentioning

confidence: 99%

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Evaluation and Analysis of CFI Schemes with Different Length of Displaced Left-Turn Lanes with Entropy Method

et al. 2021

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As an unconventional design to alleviate the conflict between left-turn and through vehicles, Continuous Flow Intersection (CFI) has obvious advantages in improving the sustainability of roadway. So far, the design manuals and guidelines for CFI are not enough sufficient, especially for the displaced left-turn lane length of CFI. And the results of existing research studies are not operational, making it difficult to put CFI into application. To address this issue, this paper presents a methodological procedure for determination and evaluation of displaced left-turn lane length based on the entropy method considering multiple performance measures for sustainable transportation, including traffic efficiency index, environment effect index and fuel consumption. VISSIM and the surrogate safety assessment model (SSAM) were used to simulate the operational and safety performance of CFI. The multi-attribute decision-making method (MADM) based on an entropy method was adopted to determine the suitability of the CFI schemes under different traffic demand patterns. Finally, the procedure was applied to a typical congested intersection of the arterial road with heavy traffic volume and high left-turn ratio in Xi’an, China, the results showed the methodological procedure is reasonable and practical. According to the results, for the studied intersection, when the Volume-to-Capacity ratio (V/C) in the westbound and eastbound lanes is less than 0.5, the length of the displaced left-turn lanes can be selected in the range of 80 to 170 m. Otherwise, other solutions should be considered to improve the traffic efficiency. The simulation results of the case showed CFI can significantly improve the traffic efficiency. In the best case, compared with the conventional intersection, the number of vehicles increases by 13%, delay, travel time, number of stops, CO emission, and fuel consumption decrease by 41%, 29%, 25%, 17%, and 17%, respectively.

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Section: Unconventional Intersectionsmentioning

confidence: 99%

“…(3) The scores of all schemes under traffic combination t can be expressed as a matrix Z s , as shown in Equation (22).…”

Section: Evaluation and Selection Of Schemesmentioning

confidence: 99%

Evaluation and Analysis of CFI Schemes with Different Length of Displaced Left-Turn Lanes with Entropy Method

et al. 2021

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“…For the frst category, it was assumed that the capacity of an isolated signalized intersection was improved by phasing and timing optimization [11,[14][15][16]. In the second category, the intersection throughput was improved by changing the geometric characteristics of the left and right turns, such as right-turn channelization and increased left-or right-turn storage length [17][18][19][20]. Te current study investigates an undersaturated isolated signalized intersection considering the geometric characteristics (i.e., number of lanes) of channelized right-turn approaches and the storage length of the left-turn approach.…”

Section: Literature Reviewmentioning

confidence: 99%

The Effect of the Number of Right-Turn and Left-Turn Lanes on the Performance of Undersaturated Signalized Intersections

Rahmani

Nasiri

Aghayan

2023

Journal of Advanced Transportation

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Vehicle traffic flow channelizing can significantly contribute to fewer collisions and smooth traffic flow in isolated signalized intersection design. Therefore, this study investigates the effect of changes in the number of right-turn lanes with splitter islands and left-turn storage bays for different volume approaches on intersection performance. This study aims to provide an accurate analysis to estimate the effect of such changes on signalized intersections, which can improve intersection performance. Furthermore, the delay parameter derived from HCM2016 and simulation was evaluated for different scenarios. For this purpose, simulation was performed using Synchro software. In this study, a symmetrical, 90-degree, undersaturated (volume per capacity lower than 1, V/C < 1), and four-leg intersection were considered according to AASHTO Green Book 2018 suggestions. HCM2016 results indicated the delay parameter was less sensitive to the undersaturated condition than the right-turn volume variation for both single and dual-lane bays. However, the simulation results indicated that the delay parameter was not constant, depending on the number of right-turn lanes and volumes. On the other hand, there was a significant difference in delay parameters between the single and dual left-turn lanes for both simulation and HCM cases estimated 77.4% and 59.7%, respectively. Overall, this study can provide a vision for traffic engineers to modify the geometry of the four-leg signalized intersections, if the right-turn or left-turn demand volume of an undersaturated signalized intersection is larger than the through approach.

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“…For instance, Arliansyah and Bawono [ 12 , 13 ] evaluated the performance of intersection junctions through measuring some important parameters such as average delay and queue length. Zheng et al [ 14 ] proposed a method for the dynamic use of the left-turn lane for opposite through traffic to improve the efficiency of the signalized intersection. Similarly, the average delay and queue length are the common measurements used to show the efficiency of the proposed method.…”

Section: Literature Surveymentioning

confidence: 99%

Turning Movement Count Data Integration Methods for Intersection Analysis and Traffic Signal Design

Shirazi

Chang

Tayeb

2022

Sensors

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Traffic simulation is widely used for modeling, planning, and analyzing different strategies for traffic control and road development in a cost-efficient manner. In order to perform an intersection simulation, random vehicle trip data are typically applied to an intersection network, making them unrealistic. In this paper, we address this issue by presenting two different methods of incorporating actual turning movement count (TMC) data and comparing their similarity for intersection simulation and analysis. The TMC of three intersections in Las Vegas are estimated separately for one hour using a developed vision-based tracking system and they are incorporated into Simulation of Urban MObility (SUMO) for estimating traffic measurements and traffic signal design. t-tests with a 95% confidence interval on the simulation variables demonstrate the importance of using a route-based creation method which injects vehicles into a simulation environment based on the frame-level departure time. The intersection analyses and comparisons are performed based on estimated traffic measurements such as travel time, density, lane density, occupancy, and normalized waiting time. Since the critical edge of each intersection network is identified based on a higher normalized waiting time, new traffic signal designs are suggested based on the actual critical turning movements and improvements in vehicle travel time are achieved to better accommodate the actual traffic demand.

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Analysis of a Signalized Intersection with Dynamic Use of the Left-Turn Lane for Opposite through Traffic

Cited by 11 publications

References 33 publications

Evaluation and Analysis of CFI Schemes with Different Length of Displaced Left-Turn Lanes with Entropy Method

Evaluation and Analysis of CFI Schemes with Different Length of Displaced Left-Turn Lanes with Entropy Method

The Effect of the Number of Right-Turn and Left-Turn Lanes on the Performance of Undersaturated Signalized Intersections

Turning Movement Count Data Integration Methods for Intersection Analysis and Traffic Signal Design

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