Analysis of Driver Response and Traffic Evolution under Variable Speed Limit Control

Han, Youngjun; Chen, Danjue; Ahn, Soyoung; Hegyi, Andreas

doi:10.3141/2490-01

Cited by 8 publications

(4 citation statements)

References 19 publications

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“…Field evaluation of VSL systems has been performed to assess the traffic flow performance [1,3,[17][18][19][20][21][22][23][24][25][26][27][28][29], driver's compliance [18,28,30,31], and safety [3,13,22,26,27,32]. Depending on the length of the motorway and available VSL system activation data, the effectiveness of the system is often analyzed in comparative terms of the changes involved in the flow-speed-density relations [1,17,24,33].…”

Section: State Of the Artmentioning

confidence: 99%

Statistical and Clustering-Based Assessment of Variable Speed Limits Effects on Motorway Performance from Real-World Observations

Isaenko,

Colombaroni,

Fusco

et al. 2024

Future Transportation

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Variable Speed Limit (VSL) systems aimed at reducing congestion and improving safety performance have been implemented around the world in previous years. However, field studies have shown controversial results regarding traffic performance improvement. This study integrates statistical testing methods and clustering techniques for assessing the effect of a non-mandatory VSL system on traffic flow performances on a 14-km portion of the Padua–Mestre motorway in Italy. Statistical analysis is conducted on the observed speeds, collected for almost one year, to identify any significant differences provided by VSL activation. The changes in global motorway performances induced by the VSL in typical traffic patterns under recurring congestion are assessed using both statistical tests and two specific clustering algorithms, namely K-means and DBSCAN. The results indicate that the VSL system effectively affects the observed speeds and alleviates congested conditions: the observed reduction in mean travel time ranges is around 4% with the VSL system active across various lanes; the standard deviation of vehicular speeds witnessed a decrease of 12% to 20% in the most congested segments, while no notable distinction is observed in traffic flows.

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Section: State Of the Artmentioning

confidence: 99%

Statistical and Clustering-Based Assessment of Variable Speed Limits Effects on Motorway Performance from Real-World Observations

Isaenko,

Colombaroni,

Fusco

et al. 2024

Future Transportation

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“…With the explosive growth of car ownership, traffic congestion, environmental pollution, and frequent accidents have become urgent problems to be solved in the current society [1,2]. In order to solve the above problems, the development of environment-friendly, safe, and intelligent vehicles has become the consensus of the automotive industry [3,4].…”

Section: Introductionmentioning

confidence: 99%

Research on Pressure Control Algorithm of Regenerative Braking System for Highly Automated Driving Vehicles

Liang

Zhao

et al. 2021

WEVJ

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Conclusive evidence has demonstrated the critical importance of highly automated driving systems and regenerative braking systems in improving driving safety and economy. However, the traditional regenerative braking system cannot be applied to highly automated driving vehicles. Therefore, this paper proposes a fully decoupled regenerative braking system for highly automated driving vehicles, which has two working modes: conventional braking and redundant braking. Aimed at the above two working modes, this paper respectively proposes the pressure control algorithm, based on P-V characteristics, and the pressure control algorithm, based on the overflow characteristics of the solenoid valve. AMESim is utilized as the simulation platform, and then is co-simulated with MATLAB/Simulink, which is embedded with the control algorithm. The simulation results show the feasibility and effectiveness of the regenerative braking system and the pressure control algorithm.

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“…Because they are placed at discrete locations, it is difficult to detect dynamic traffic conditions and deliver control in time. Notably, the analysis for the SPECIALIST field test revealed that control failure likely resulted from dynamic traffic conditions such as increases in demand or on-ramp inflow (Han et al, 2015). Moreover, deployment of VMSs can be very costly.…”

Section: Introductionmentioning

confidence: 99%

Variable speed limit control at fixed freeway bottlenecks using connected vehicles

Han

Chen

Ahn

2017

Transportation Research Part B: Methodological

Self Cite

110

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The connected vehicle (CV) technology is applied to develop VSL strategies to improve bottleneck discharge rates and reduce system delays. Three VSL control strategies are developed with different levels of complexity and capabilities to enhance traffic stability using: (i) only one CV (per lane) (Strategy 1), (ii) one CV (per lane) coupled with variable message signs (Strategy 2), and (iii) multiple CVs (Strategy 3). We further develop adaptive schemes for the three strategies to remedy potential control failures in real time. These strategies are designed to accommodate different queue detection schemes (by CVs or different sensors) and CV penetration rates. Finally, probability of control failure is formulated for each strategy based on the stochastic features of traffic instability to develop a general framework to (i) estimate expected delay savings, (ii) assess the stability of different VSL control strategies, and (iii) determine optimal control speeds under uncertainty. Compared to VMS-only strategies, the CVbased strategies can effectively impose dynamic control over continuous time and space, enabling (i) faster queue clearance around a bottleneck, (ii) less restrictive control with higher control speed (thus smoother transition), and (iii) simpler control via only one or a small number of CVs.

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Analysis of Driver Response and Traffic Evolution under Variable Speed Limit Control

Cited by 8 publications

References 19 publications

Statistical and Clustering-Based Assessment of Variable Speed Limits Effects on Motorway Performance from Real-World Observations

Statistical and Clustering-Based Assessment of Variable Speed Limits Effects on Motorway Performance from Real-World Observations

Research on Pressure Control Algorithm of Regenerative Braking System for Highly Automated Driving Vehicles

Variable speed limit control at fixed freeway bottlenecks using connected vehicles

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