Evaluation of the impacts of cooperative adaptive cruise control on reducing rear-end collision risks on freeways

Li, Ye; Wang, Hao; Wang, Weixu; Xing, Lu; Liu, Shan-Wen; Wei, Xueyan

doi:10.1016/j.aap.2016.09.015

Cited by 180 publications

(71 citation statements)

References 27 publications

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“…The standard deviation of speed, as a Safety Surrogate Assessment Model (SSAM) (Lee et al, 2014;Li et al, 2017), has been used to assess the safety performance (Gettman and Head, 2003). Generally, a lower value in the standard deviation of speed represents a more stable traffic flow (Songchitruksa et al, 2016).…”

Section: Safetymentioning

confidence: 99%

The effectiveness of managed lane strategies for the near-term deployment of cooperative adaptive cruise control

Zhong

Lee

2019

Transportation Research Part A: Policy and Practice

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Traffic simulation is a cost-effective way to test the deployment of Cooperative Adaptive Cruise Control (CACC) vehicles in a large-scale transportation network. By using a previously developed microscopic simulation testbed, this paper examines the impacts of four managed lane strategies for the near-term deployment of CACC vehicles under mixed traffic conditions. Network-wide performance measures are investigated from the perspectives of mobility, safety, equity, and environmental impacts. In addition, the platoon formation performance of CACC vehicles is evaluated with platoon-orientated measures, such as the percentage of platooned CACC vehicles, average platoon depth, and vehicle-hour-platooned that is proposed in this paper under the imperfect DSRC communication environment. Moreover, managed lane score matrices are developed to incorporate heterogeneous categories of performance measures, aiming to provide a more comprehensive picture for stakeholders. The results show that mixing CACC traffic along with non-CACC traffic across all travel lanes is an acceptable option when the market penetration (MP) is lower than 30% for roadways where a managed lane is absent. Providing CACC with priority access to an existing managed lane, if available, is also a good strategy for improving the overall traffic performance when the MP is lower than 40%. When the MP reaches above 40%, a dedicated lane for CACC vehicles is recommended, as it provides greater opportunity for CACC vehicles to form platoons. The facilitation of homogeneous CACC traffic flow could make further improvements possible in the future.

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Section: Safetymentioning

confidence: 99%

The effectiveness of managed lane strategies for the near-term deployment of cooperative adaptive cruise control

Zhong

Lee

2019

Transportation Research Part A: Policy and Practice

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“…If the predecessor is a platoon member itself, it checks with the maximum allowed platoon to see if platoon formation is allowed. The maximum platoon size is usually limited to 10 in literature (Songchitruksa et al, 2016;Li et al, 2017). We test with no restriction on the maximum size so as observe the maximum sized platoon that can be formed in this ad-hoc setting.…”

Section: Modeling Cacc Platoonsmentioning

confidence: 99%

“…When the follower is in gap closing mode, we use the car-following model used by Songchitruksa et al (2016), which is as follows: When the difference between current space gap and desired space gap drops below 20 m, the follower switches to CACC control mode where the behavior is described by the model proposed by Li et al (2017): a n tzt d ð Þ~a acc zl 1 a 1 t ð Þzl n{1 a n{1 (t) ðEq: 7:6Þ…”

Section: Modeling Cacc Platoonsmentioning

confidence: 99%

Strategic and Tactical Guidance for the Connected and Autonomous Vehicle Future

Ukkusuri¹,

Sagir²,

Mahajan³

et al. 2019

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JOINT TRANSPORTATION RESEARCH PROGRAMThe Joint Transportation Research Program serves as a vehicle for INDOT collaboration with higher education institutions and industry in Indiana to facilitate innovation that results in continuous improvement in the planning, design, construction, operation, management and economic efficiency of the Indiana transportation infrastructure. Abstract Autonomous vehicle (AV) and connected vehicle (CV) technologies are rapidly maturing and the timeline for their wider deployment is currently uncertain. These technologies are expected to have a number of significant societal benefits: traffic safety, improved mobility, improved road efficiency, reduced cost of congestion, reduced energy use, and reduced fuel emissions. State and local transportation agencies need to understand what this means for them and what they need to do now and in the next few years to prepare for the AV/CV future. In this context, the objectives of this research are as follows:1. Synthesize the existing state of practice and how other state agencies are addressing the pending transition to AV/CV environment 2. Estimate the impacts of AV/CV environment within the context of (a) traffic operations-impact of headway distribution and traffic signal coordination; (b) traffic control devices; (c) roadway safety in terms of intersection crashes 3. Provide a strategic roadmap for INDOT in preparing for and responding to potential issues This research is divided into two parts. The first part is a synthesis study of existing state of practice in the AV/CV context by conducting an extensive literature review and interviews with other transportation agencies. Based on this, we develop a roadmap for INDOT and similar agencies clearly delineating how they should invest in AV/CV technologies in the short, medium, and long term. The second part assesses the impacts of AV/CVs on mobility and safety via modeling in microsimulation software Vissim. 17.

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“…The entire system showed good performance in testing real-world scenarios, both in computer simulation and with real vehicles.Shladover et al analyzed the advantages of cooperative adaptive cruise control (CACC) based on cooperative communication including higher accuracy, faster response, and shorter gaps, resulting in enhanced traffic flow stability and possibly improved safety [40]. Li et al developed a V2I integrated system that incorporated both adaptive cruise control (ACC) and variable speed limit (VSL) to reduce rear-end collision risks on freeways [41,42], and the intelligent driver model (IDM) was used to simulate intelligent vehicles' behavior [41][42][43][44]. Moreover, Dey et al demonstrated the potential of V2I in a heterogeneous wireless network with variable communication techniques that guaranteed the optimal utilization of available communication options and minimized the corresponding backhaul communication infrastructure requirements while considering CAV application requirements [45].…”

mentioning

confidence: 99%

Simulation-Based Assessment of Multilane Separate Freeways at Toll Station Area: A Case Study from Huludao Toll Station on Shenshan Freeway

et al. 2019

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To support the rapid growth of demand in passengers and freight, separating trucks and passenger-cars is a potential solution to improve traffic efficiency and safety. The primary purpose of this paper is to comprehensively assess the multilane separate freeway at Huludao Toll Station in Liaoning Province, China. Based on the configuration and segmentation of the freeway near a toll station, a six-step guidance strategy is designed to adapt to the separate organization mode. Five conventional traffic scenarios are designed in the Vissim platform for comparative analysis between different guidance strategies. To investigate the vehicle-to-infrastructure (V2I) environment, a microscopic testbed is established with cooperative car-following and lane-changing models using the MATLAB platform. The numerical simulation results show that the guidance strategy significantly improves efficiency and safety, and also reduces emissions and fuel consumption. Meanwhile, pre-guidance before toll channels outperforms the scenario only applied with guidance measures after toll plaza. Compared to conventional conditions, the assessment of pollutant emissions and fuel consumption also embodies the superiority of the other five scenarios, especially in the sections of toll plaza and channels with the lowest efficiency and safety level. Generally, all indexes indicate that the cooperative V2I technology is the best alternative for multilane separate freeways.

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Evaluation of the impacts of cooperative adaptive cruise control on reducing rear-end collision risks on freeways

Cited by 180 publications

References 27 publications

The effectiveness of managed lane strategies for the near-term deployment of cooperative adaptive cruise control

The effectiveness of managed lane strategies for the near-term deployment of cooperative adaptive cruise control

Strategic and Tactical Guidance for the Connected and Autonomous Vehicle Future

Simulation-Based Assessment of Multilane Separate Freeways at Toll Station Area: A Case Study from Huludao Toll Station on Shenshan Freeway

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