Evaluation of Variable Speed Limit Pilot Projects for Texas Department of Transportation

Kuhn, Beverly; Balke, Kevin; Brydia, R E; Theiss, LuAnn; Tsapakis, Ioannis; Ruback, Leonard; Le, Minh

doi:10.1016/j.trpro.2016.06.057

Cited by 5 publications

(6 citation statements)

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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%

“…Robust schemes of effectiveness evaluation need to be applied in different locations to assess the implementation of the VSL further. The assessment of the effectiveness of the system is usually measured by estimation of the total travel time spent [3,17,18,20,23,25,27], higher percentiles of the drivers' speed distribution [1,21,22,26,[30][31][32]34,35], and the changes implied to the capacity [10,24,25,29].…”

Section: State Of the Artmentioning

confidence: 99%

See 1 more Smart Citation

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%

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

View full text Add to dashboard Cite

show abstract

“…which is determined by the length L n (m, which can be read by the reader) between the two buttons and the vehicle traveling speed V (km/h), t = L n / 3.6V (1 m/s = 3.6 km/h substituted into Equation 1, that is Equation (2).…”

Section: B Working Principle Of the Onboard Subsystemmentioning

confidence: 99%

“…In more than 10 countries in Europe, including France and the Netherlands, the maximum speed limit on highways is 130 km/h [1]; in Texas, USA, it is 137 km/h (85 mile/h) [2]; in Italy, Saudi Arabia, Poland, it is 140 km/h [3]; and in Germany, there is no speed limit on some highways [4]. The Highway Engineering Design Guidelines (Draft) published in 1951stipulated that the maximum design speed of highways in China was 120 km/h, and it has been used to date [5].…”

Section: Introductionmentioning

confidence: 99%

Superhighway Virtual Track System Based on Intelligent Road Buttons

Pei

Kang

et al. 2020

IEEE Access

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To improve the safety of superhighways, a virtual track system for superhighways based on intelligent road buttons is studied by means of a structural analysis and mathematical model. The system consists of a road subsystem, onboard subsystem and service center subsystem. When a vehicle equipped with an onboard subsystem nears the road buttons, they activate the virtual track system, and the reader reads location coordinates and road alignment information at that point from the label buttons. At the same time, the data processing module begins to function. First, the module reads the linear parameters and processes them to obtain the angle between the road tangent and vehicle body. Then, the module reads the angle of the front wheels, the vehicle speed and the distance between the adjacent two label buttons. Finally, the module obtains the rotational speed of the steering wheel while the vehicle is driving between two label buttons by using the computational model and sends the control parameters to the steering motor. The research results show that when the design speed of the superhighway is 140 km/h, 160 km/h and 180 km/h and the distances between the road buttons are less than 1.33 m, 1.50 m and 1.69 m, respectively, the distance between the centerline of the road and the vehicle can be restricted to less than 50 cm. Therefore, the virtual track system based on intelligent road buttons can restrict vehicles to travel in the virtual track and ensure the safety of superhighways.

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“…In more than 10 countries in Europe, such as France and the Netherlands, the maximum speed limit on highways is 130 km/h [1], and in Texas, USA, the maximum speed limit is 137 km/h (85 mile/h) [2]; in Italy, it is 140 km/h [3], while in Germany, there is no maximum speed limit on some highways [4]. e Highway Engineering Design Guidelines (Draft) published in 1951 stipulated for the first time that the maximum design speed of highways in China was 120 km/h, and it has been used ever since [5].…”

Section: Introductionmentioning

confidence: 99%

Theoretical Research on Longitudinal Profile Design of Superhighways

Song

Pei

et al. 2020

Journal of Advanced Transportation

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To improve driving safety on superhighways, longitudinal profile design parameters of a superhighway are calculated via force analysis while a car is driven on a slope. The calculations consider characteristics of drivers, cars, and roads. According to the vehicle type, design speed, and natural conditions, the maximum longitudinal slope of a superhighway is calculated and compared with those of an ordinary superhighway and high-speed railway. Based on analysis of the vehicle climbing performance, braking performance, and driver visual characteristics, the maximum and minimum slope lengths of a superhighway are calculated. By analyzing the elements of vertical curves, the minimum radius and minimum length of the vertical curves of a superhighway are calculated by considering factors such as mitigating the impact at the slope bottom, driving at night, and driving time along vertical curves. Analysis and calculation results show that when the maximum longitudinal slope is 2.50%, 2.25%, and 2.00%, the minimum slope length is 450 m, 400 m, and 350 m, respectively, and the minimum vertical curve length is 145 m, 130 m, and 115 m, respectively, and the superhighway travel requirements can be satisfied at speeds of 180 km/h, 160 km/h, and 140 km/h, respectively.

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Evaluation of Variable Speed Limit Pilot Projects for Texas Department of Transportation

Cited by 5 publications

References 0 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

Superhighway Virtual Track System Based on Intelligent Road Buttons

Theoretical Research on Longitudinal Profile Design of Superhighways

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