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    Vehicle Speed and Acceleration Profile Study for Metered On-Ramps in California

    Source: Journal of Transportation Engineering:;2016:;Volume ( 142 ):;issue: 002
    Author:
    Guangchuan Yang
    ,
    Hao Xu
    ,
    Zong Tian
    ,
    Zhongren Wang
    DOI: 10.1061/(ASCE)TE.1943-5436.0000817
    Publisher: American Society of Civil Engineers
    Abstract: Ramp metering has been proven as an effective freeway-management strategy; however, one of the critical challenges in design and operation of ramp metering is the lack of up-to-date design guidance for acceleration lanes. This paper aims to investigate the actual acceleration characteristics for metered on-ramps with various geometric features and also figure out speed profiles to guide the design of acceleration-lane length. A piecewise-constant acceleration model, which assumes vehicles making uniformly accelerated motion within each short space or time interval, was employed to model vehicle acceleration characteristics. The approach of using distance versus speed profiles for acceleration-length design was also introduced. Results show that acceleration rate at metered on-ramps is not constant; vehicles usually accelerate at a higher acceleration rate when speed is lower and vice versa. It was observed that taper ramps usually produce higher acceleration rates than ramps with an auxiliary lane, and existing acceleration length would also affect drivers’ acceleration behavior. Finally, this study pointed out that the acceleration performance data documented in the AASHTO Green Book, which are now widely employed by several state DOTs in the United States as acceleration length design guidance for metered on-ramps, is approximately 1.7 times greater than the value measured at typical taper-type metered on-ramp in California.
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      Vehicle Speed and Acceleration Profile Study for Metered On-Ramps in California

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4244676
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    contributor authorGuangchuan Yang
    contributor authorHao Xu
    contributor authorZong Tian
    contributor authorZhongren Wang
    date accessioned2017-12-30T13:01:32Z
    date available2017-12-30T13:01:32Z
    date issued2016
    identifier other%28ASCE%29TE.1943-5436.0000817.pdf
    identifier urihttp://138.201.223.254:8080/yetl1/handle/yetl/4244676
    description abstractRamp metering has been proven as an effective freeway-management strategy; however, one of the critical challenges in design and operation of ramp metering is the lack of up-to-date design guidance for acceleration lanes. This paper aims to investigate the actual acceleration characteristics for metered on-ramps with various geometric features and also figure out speed profiles to guide the design of acceleration-lane length. A piecewise-constant acceleration model, which assumes vehicles making uniformly accelerated motion within each short space or time interval, was employed to model vehicle acceleration characteristics. The approach of using distance versus speed profiles for acceleration-length design was also introduced. Results show that acceleration rate at metered on-ramps is not constant; vehicles usually accelerate at a higher acceleration rate when speed is lower and vice versa. It was observed that taper ramps usually produce higher acceleration rates than ramps with an auxiliary lane, and existing acceleration length would also affect drivers’ acceleration behavior. Finally, this study pointed out that the acceleration performance data documented in the AASHTO Green Book, which are now widely employed by several state DOTs in the United States as acceleration length design guidance for metered on-ramps, is approximately 1.7 times greater than the value measured at typical taper-type metered on-ramp in California.
    publisherAmerican Society of Civil Engineers
    titleVehicle Speed and Acceleration Profile Study for Metered On-Ramps in California
    typeJournal Paper
    journal volume142
    journal issue2
    journal titleJournal of Transportation Engineering, Part A: Systems
    identifier doi10.1061/(ASCE)TE.1943-5436.0000817
    page04015046
    treeJournal of Transportation Engineering:;2016:;Volume ( 142 ):;issue: 002
    contenttypeFulltext
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