Investigation the Effect of Speed Humps on Merging Time of U-turn Traffic

Al-Obaedi, Jalal

doi:10.1016/j.asej.2018.12.001

Cited by 14 publications

(9 citation statements)

References 10 publications

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“…The time spent (TS) for each individual vehicle represents the time from reaching the vehicle to the median of the U-turn section until its completing the merging into the opposite direction. For further information about the time spent data used in this study and the method of calculation [11]. The time spent for merging is selected instead of traffic delay because that the time spend can be accurately obtained from video recordings while it is difficult to obtain the traffic delay from the videos as the delay calculation is related to the desired speed at the approach.…”

Section: Methodsmentioning

confidence: 99%

“…The traffic volumes of merging traffic, opposing traffic and ATS data for each 5 minutes time interval for sites 1, 2 and 3 is based on the author previous work [11]. The data is presented in the simulation section below of this paper to eliminate repetition.…”

Section: Traffic Volumes and Time Spent Datamentioning

confidence: 99%

“…In addition, lower ATS values were obtained for the sites with speed humps compared with the site 1 without speeds hump. Please see [11] for further details regarding the parameters affecting ATS.…”

Section: Traffic Volumes and Time Spent Datamentioning

confidence: 99%

“…One of the common types of U-turn section is the "median Uturn" that provides special path (opening) through medians of multilane highways to allow traffic from making their turn into the opposite direction. Another type of U-turn section is represented by allowing traffic from making U-turn movement at intersection and roundabouts [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…Such turning process forces the opposing traffic to reduce speeds in approaching the turning location. The microscopic behavior of the opposing vehicles is either decelerating, shifting to another lane, or continue moving by ignoring the turning traffic [11].…”

Section: Introductionmentioning

confidence: 99%

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Simulating the Effect of Speed Humps on the U-Turn Traffic

Al-Obaedi

2019

IJE

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Traffic simulation represents an effective tool for evaluating the suggested alternatives to enhance traffic conditions prior to their application in real sites. U-turn sections represent examples of the complicated sections that cannot be analyzed properly without applying microsimulation approach. Recently, in Iraq, speed humps were applied in prior to the merging locations and U-turn sections to enhance traffic safety. However, the characteristics of traffic at U-turn section with the presence of speed humps have got little attention in previous literatures. This paper uses VISSIM microsimulation model to emulate traffic movements at selected U-turn sites in the cases of with and without speed humps. Three median U-turn sites have been selected where two of these sites have speed humps prior to the turning locations. Real traffic data have been obtained from these sites using video recordings to estimate specific parameters. The developed simulation models were successfully calibrated and validated with the real data. The models have been used in testing different scenarios including the effect of having different locations/ types of speed humps and finding the capacity of U-turn sections. The results showed that closer the speeds hump to the turning location is lower the time spent for merging. The time spent values are increased with the increasing of traffic speeds at humps. Higher capacity value is obtained for the site with an auxiliary lane and speeds hump compared with the other sites.

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Section: Methodsmentioning

confidence: 99%

Section: Traffic Volumes and Time Spent Datamentioning

confidence: 99%

Section: Traffic Volumes and Time Spent Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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