Original scientific paper
https://doi.org/10.7307/ptt.v33i1.3582
Modelling of Queue Length in Freeway Work Zones – Case Study Karaj-Tehran Freeway
Mojtaba Mousazadeh Gilandeh
orcid.org/0000-0001-8018-6754
; Sapienza University of Rome, Rome, Italy
Sari Sharif Ali
; University of Guilan, Rasht, Iran
Mohammad Javad Goodarzi
; Sharif University of Technology, Tehran, Iran
Nahid Amini
orcid.org/0000-0001-8187-3556
; Islamic Azad University, Tehran, Iran
Hassan Latifi
orcid.org/0000-0002-9939-0349
; Islamic Azad University, Tehran, Iran
Abstract
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.
Keywords
freeway work zone; modelling of queue length; traffic parameters; Karaj-Tehran freeway case study
Hrčak ID:
253184
URI
Publication date:
5.2.2021.
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