Driver Response to an Actuated Advance Warning System

Appiah, Justice; Rilett, Laurence R.; Naik, Bhaven; Wojtal, Remigiusz

doi:10.1061/(asce)te.1943-5436.0000522

Cited by 2 publications

(3 citation statements)

References 8 publications

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“…Based on this fact, driver behavior can be modeled in a manner similar to that of the NST scenario. A complete description of ADS may be found elsewhere (Appiah et al, 2011;McCoy and Pesti, 2002). AWS was the third countermeasure to be examined.…”

Section: Safety Treatmentsmentioning

confidence: 99%

“…For example, no transportation agency would allow an experimental design in which a system would be installed and then turned on and off to analyze the resulting safety impacts in terms of crash rates. However, it has been demonstrated that these systems do reduce crashes in comparison to unequipped intersections; this reduction has been attributed to a reduced number of vehicles caught in the dilemma zone (Appiah et al, 2011). In addition, empirical measurements of similar intersections with and without these systems present have demonstrated that the treatments reduce driver speeds at the onset of flashing warning lights.…”

Section: Number Of Vehicles In Dilemma Zonementioning

confidence: 99%

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Development of a statistically-based methodology for analyzing automatic safety treatments at isolated high-speed signalized intersections

Wojtal

Rilett

2017

AoT

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Crashes at isolated rural intersections, particularly those involving vehicles traveling perpendicularly to each other, are especially dangerous due to the high speeds involved. Consequently, transportation agencies are interested in reducing the occurrence of this crash type. Many engineering treatments exist to improve safety at isolated, high-speed, signalized intersections. Intuitively, it is critical to know which safety treatments are the most effective for a given set of selection criteria at a particular intersection. Without a well-defined decision making methodology, it is difficult to decide which safety countermeasure, or set of countermeasures, is the best option. Additionally, because of the large number of possible intersection configurations, traffic volumes, and vehicle types, it would be impossible to develop a set of guidelines that could be applied to all signalized intersections. Therefore, a methodology was developed in in this paper whereby common countermeasures could be modeled and analyzed prior to being implemented in the field. Due to the dynamic and stochastic nature of the problem, the choice was made to employ microsimulation tools, such as VISSIM, to analyze the studied countermeasures. A calibrated and validated microsimulation model of a signalized intersection was used to model two common safety countermeasures. The methodology was demonstrated on a test site located just outside of Lincoln, Nebraska. The model was calibrated to the distribution of observed speeds collected at the test site. It was concluded that the methodology could be used for the preliminary analysis of safety treatments based on select safety and operational measures of effectiveness.

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Section: Safety Treatmentsmentioning

confidence: 99%

Section: Number Of Vehicles In Dilemma Zonementioning

confidence: 99%

Development of a statistically-based methodology for analyzing automatic safety treatments at isolated high-speed signalized intersections

Wojtal

Rilett

2017

AoT

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“…Previous research on high-speed, isolated intersections found that drivers tend to slow when the AWF is activated (2). When the AWF is placed in a coordinated signalization system corridor, it is not clear whether the AWF affects PD.…”

mentioning

confidence: 96%

Calibrating the Robertson’s Platoon Dispersion Model on a Coordinated Corridor with Advance Warning Flashers

Zhao

Rilett

Tufuor

2017

Transportation Research Record: Journal of the Transportation R

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Platoon dispersion (PD) is the foundation of traffic signal coordination in an urban traffic network. PD describes the phenomenon by which vehicles depart from an upstream intersection as a platoon and begin to disperse before they arrive at the downstream intersection. Recently, advance warning flashers (AWFs) have been applied in many high-speed corridors. There is a need to update the traditional PD model to include the effect of AWFs. This paper examines the traffic flow dispersion patterns when an AWF is present and tests the hypothesis that the AWF will affect PD on a coordinated signal corridor. Platoon vehicles, which are not affected by the operation of the AWF, are used for comparison. Results show that when the AWF effect is included in the PD model, the smoothing factor F of the Robertson's PD model ranges from 0.11 to 0.13. This range is smaller than the smoothing factor without the AWF effect. The platoon

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Driver Response to an Actuated Advance Warning System

Cited by 2 publications

References 8 publications

Development of a statistically-based methodology for analyzing automatic safety treatments at isolated high-speed signalized intersections

Development of a statistically-based methodology for analyzing automatic safety treatments at isolated high-speed signalized intersections

Calibrating the Robertson’s Platoon Dispersion Model on a Coordinated Corridor with Advance Warning Flashers

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