Volume warrants for major and minor roads left-turning traffic lanes at unsignalized T-intersections: A case study using VISSIM modelling

Nyame-Baafi, Eric; Adams, Charles A.; Osei, Kwame Kwakwa

doi:10.1016/j.jtte.2018.01.005

Cited by 15 publications

(10 citation statements)

References 7 publications

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“…At the same time, since it is difficult to obtain the capacity value of TSLSR under different geometric layout and signal timing parameters, this paper employs the VISSIM simulation as the benchmark. The TSLSR was modeled by VISSIM [20] by using Figure 3 as the base image. The image was imported and scaled, and the links and connectors representing the roadway were then drawn.…”

Section: Model Accuracy Testmentioning

confidence: 99%

Investigation on Two-Stop-Line Signalized Roundabout: Capacity and Optimal Cycle Length

Jiang

Wang

et al. 2019

Journal of Advanced Transportation

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Two-stop-line signalized roundabouts (TSLSR) are widely utilized in China. To calculate the capacity and optimal cycle length accurately, a model considering internal space constraint of the roundabout is developed in this paper. Firstly, the operational principle of TSLSR is analyzed. TSLSR is modeled as being equivalent to a four-phase intersection with left-turn protection phases, and the left-turn lane is further simplified as the “short-lane model”. Secondly, based on the above analysis, the capacity of TSLSR is modeled and additionally, the accuracy and sensitivity of the model are also analyzed. Finally, the optimal cycle length of TSLSR which maximizes the capacity is put forward. Results show that the accuracy of the capacity model is low without considering the internal space constraint of the roundabout. However, the model developed in this paper is shown to improve the accuracy (about 20%) and control the relative error to be within 10%. The parameter sensitivity analysis demonstrates that the cycle length and radius of the central island have a significant influence on the capacity of the left-turn lane and results in an optimal value of signal cycle length maximizing the capacity.

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Section: Model Accuracy Testmentioning

confidence: 99%

Investigation on Two-Stop-Line Signalized Roundabout: Capacity and Optimal Cycle Length

Jiang

Wang

et al. 2019

Journal of Advanced Transportation

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“…For the entry flow measurement, the data was obtained by using the "data collection point" tool in VISSIM. The function of the data collection points is similar to counting boards which are attached to roadway tracks for recording of traffic volume in some countries [12]. Data collection points were used to count the simulated throughput of vehicles when placed at the intersection of in/out feed of the main road and slip road.…”

Section: A Entry Flow Measurementmentioning

confidence: 99%

Vissim-based Simulation of Variable Slip Road Length Design of the Federal Highway in Malaysia

2019

IJRTE

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Traffic congestion on highways is mainly the result of overcrowding. This phenomenon happens when a great number of vehicles storm the road, disrupting the smooth flow of traffic. In this study, traffic simulation, using PTV Vissim software as a scenario planning tool, was conducted to analyze slip road length as a traffic congestion source at a selected intersection point. The intersection point was designed based on Federal Highway between KM14.8 and KM14.5 in Shah Alam. The VISSIM model was calibrated using traffic flow, delay time, average number of vehicles and maximum queue length data obtained from one-hour instances of video recordings of the respective intersection during evening peak periods. Based on the field data, the average throughput is 1003 vehicles with an average speed of 40 m/s. The traffic condition in the area can be regarded as congested. One of the reasons for congestion in this area is the proximity between in and out feed to the Federal Highway. Three different distances between in and out feed to the Federal Highway were simulated, which were 140m, 280m (baseline) and 420m. Based on the results obtained from the simulation, it could be gathered that the longer the slip road, the higher the length of delay. However, the distance of the in/out feed had little to no effect in terms of vehicle throughput. While running the simulation, it could be observed that the delay mainly occurred due to merging and lane-changing activities at the input. Nonetheless, further analysis is needed for different slip road settings to conclude congestion pattern based on road design.

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“…10 vehicles were chosen randomly from the simulation and their speeds and travel times were calculated for each peak hour in each lane. It is an approach used by Nyame-Baafi et al [22] for unsignalized intersections which was also present at avenue 27. A comparison was made between the introduced speeds and the speeds provided by the ministry of works using the validation criteria given in table I.…”

Section: A Calibration and Validationmentioning

confidence: 99%

Calibrating Traffic Microsimulation Model for Bahrain and Estimating Traffic Impacts of a Mall on Road Network

al.¹

2019

IJCDS

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Traffic simulation programs such as VISSIM are frequently used worldwide as a tool, for analyzing transportation problems, with minimum cost. Traffic simulation is an effective approach for finding out the benefits and limitations of different alternatives. Advancements in computer technology have led to the development of high-quality microscopic simulation models. The calibration of a simulation model is the main step for obtaining any representative results from the analysis. Therefore, objectives of this study include; to calibrate a microscopic simulation model using VISSIM for Bahrain and to estimate the effects of construction of a new mall using the calibrated microscopic simulation model. The study location was Avenue 27, Saar, Kingdom of Bahrain. Traffic data from two intersections of this avenue, which were in the vicinity of a new mall (El Marcado), was collected for the period before and after the construction of the mall. The road segment between the intersections had a length of 600m. The posted speed of the road is 50Km/hr. Ministry of Works provided the data for straight movement on this segment and proportion of turning movements were estimated from a dataset collected by the research team for a shorter time period in AM and PM peak hours. A microsimulation model was calibrated on the studied segment using the dataset collected by the research team. Default values for several parameters such as volume, average travel time and average travel speed were modified to replicate field conditions. The results with the modified values showed no significant discrepancy between the model simulation and the field observed values. The simulation model was run on the data provided by the ministry for the periods before and after construction of the mall. The simulation results showed a clear deterioration in traffic conditions on the overall network and more specifically for turning movements towards the mall. Increase in traffic, due to the mall, reduced Level of Service (LOS) on the intersections and doubled the queue length and delay on them. The environmental estimation method in VISSIM was not found to be effective in accurate simulation of emissions and fuel consumption.

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Volume warrants for major and minor roads left-turning traffic lanes at unsignalized T-intersections: A case study using VISSIM modelling

Cited by 15 publications

References 7 publications

Investigation on Two-Stop-Line Signalized Roundabout: Capacity and Optimal Cycle Length

Investigation on Two-Stop-Line Signalized Roundabout: Capacity and Optimal Cycle Length

Vissim-based Simulation of Variable Slip Road Length Design of the Federal Highway in Malaysia

Calibrating Traffic Microsimulation Model for Bahrain and Estimating Traffic Impacts of a Mall on Road Network

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