Estimation of Road Capacity at Two-Lane Freeway Work Zones Considering the Rate of Heavy Vehicles

2020 ◽  
Vol 19 (2) ◽  
pp. 48-61
Author(s):  
Eunjeong Ko ◽  
◽  
Hyungjoo Kim ◽  
Shin Hyoung Park ◽  
Kitae Jang
Keyword(s):  
Heavy Vehicles ◽  
Work Zones ◽  
Road Capacity ◽  
Freeway Work Zones

scholarly journals Modelling of Queue Length in Freeway Work Zones – Case Study Karaj-Tehran Freeway

2021 ◽  
Vol 33 (1) ◽  
pp. 49-59
Author(s):  
Mojtaba Mousazadeh Gilandeh ◽  
Sari Sharif Ali ◽  
Mohammad Javad Goodarzi ◽  
Nahid Amini ◽  
Hassan Latifi
Keyword(s):  
Flow Rate ◽  
Queue Length ◽  
Abrupt Change ◽  
Heavy Vehicles ◽  
Work Zones ◽  
Maintenance And Rehabilitation ◽  
Abrupt Changes ◽  
Queue Lengths ◽  
Freeway Work Zones

In this study, the traffic parameters were collected from three work zones in Iran in order to evaluate the queue length in the work zones. The work zones were observed at peak and non-peak hours. The results showed that abrupt changes in Freeway Free Speed (FFS) and arrival flow rate caused shockwaves and created a bottleneck in that section of the freeway. In addition, acceleration reduction, abrupt change in the shockwave speed, abrupt change in the arrival flow rate and increase in the percentage of heavy vehicles have led to extreme queue lengths and delay. It has been found that using daily traffic data for scheduling the maintenance and rehabilitation projects could diminish the queue length and delay. Also, by determining the bypass for heavy vehicles, the delay can be significantly reduced; by more than three times. Finally, three models have been presented for estimating the queue length in freeway work zones. Moreover, the procedure shown for creating a queue length model can be used for similar freeways.

scholarly journals Capacity of Freeway Work Zones in Germany

2016 ◽  
Vol 15 ◽  
pp. 233-244 ◽  
Author(s):  
Nina von der Heiden ◽  
Justin Geistefeldt
Keyword(s):  
Work Zones ◽  
Freeway Work Zones

Guidelines for Using Late Merge Traffic Control in Work Zones

2005 ◽  
Vol 1911 (1) ◽  
pp. 42-50 ◽  
Author(s):  
Andrew G. Beacher ◽  
Michael D. Fontaine ◽  
Nicholas J. Garber
Keyword(s):  
Control Strategy ◽  
Traffic Control ◽  
Work Zone ◽  
Storage Space ◽  
Heavy Vehicles ◽  
Work Zones ◽  
Microscopic Traffic Simulation ◽  
Traffic Stream ◽  
Flow At Work ◽  
Full Factorial

The late merge traffic control strategy has been proposed as a way to improve flow at work zone lane closures by maximizing queue storage space and creating more orderly merging. The late merge instructs drivers to use all lanes to the work zone taper and then take turns proceeding through the work zone. There is little information available on when the late merge should be used, however, and a limited understanding of the factors that influence its performance. This paper discusses the results of a simulation study of the late merge concept using microscopic traffic simulation. The late merge concept was evaluated by comparing it with traditional traffic control, through a full factorial analysis. Results of the computer simulations showed that the late merge produced a statistically significant increase in throughput volume versus the traditional merge for the three-to-one lane closure configuration across all combinations of analysis factors. Although the two-to-one and three-to-two configurations did not show significant improvement in throughput overall, it was found that as the percentage of heavy vehicles increased, the late merge did foster higher throughput volumes than traditional traffic control. The results of the simulations indicate that the late merge may not provide as much of a benefit as previous studies had indicated and that the area of application for the late merge may be limited to situations where heavy vehicles constitute more than 20% of the traffic stream.

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