Improving Safety and Mobility at High-Speed Intersections with Innovations in Sensor Technology

Sharma, Anuj; Bullock, Darcy M.; Velipasalar, Senem; Casares, Mauricio; Schmitz, Jacob; Burnett, Nathaniel P

doi:10.3141/2259-24

Cited by 15 publications

(9 citation statements)

References 10 publications

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“…Studies have demonstrated that extending detection further upstream of an intersection can result in reductions in dilemma zone incursions ( 4 , 7 , 18 ). Using camera- or radar-based wide-area detectors can also mitigate dilemma zones and improve efficiency and safety at deployed intersections, but these require sensor calibration ( 19 , 20 ).…”

Section: Motivationmentioning

confidence: 99%

Using Connected Vehicle Data to Reassess Dilemma Zone Performance of Heavy Vehicles

Platte

Mathew

et al. 2020

Transportation Research Record: Journal of the Transportation R

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The rate of fatalities at signalized intersections involving heavy vehicles is nearly five times higher than for passenger vehicles in the US. Previous studies in the US have found that heavy vehicles are twice as likely to violate a red light compared with passenger vehicles. Current technologies leverage setback detection to extend green time for a particular phase and are based upon typical deceleration rates for passenger cars. Furthermore, dilemma zone detectors are not effective when the max out time expires and forces the onset of yellow. This study proposes the use of connected vehicle (CV) technology to trigger force gap out (FGO) before a vehicle is expected to arrive within the dilemma zone limit at max out time. The method leverages position data from basic safety messages (BSMs) to map-match virtual waypoints located up to 1,050 ft in advance of the stop bar. For a 55 mph approach, field tests determined that using a 6 ft waypoint radius at 50 ft spacings would be sufficient to match 95% of BSM data within a 5% lag threshold of 0.59 s. The study estimates that FGOs reduce dilemma zone incursions by 34% for one approach and had no impact for the other. For both approaches, the total dilemma zone incursions decreased from 310 to 225. Although virtual waypoints were used for evaluating FGO, the study concludes by recommending that trajectory-based processing logic be incorporated into controllers for more robust support of dilemma zone and other emerging CV applications.

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Section: Motivationmentioning

confidence: 99%

Using Connected Vehicle Data to Reassess Dilemma Zone Performance of Heavy Vehicles

Platte

Mathew

et al. 2020

Transportation Research Record: Journal of the Transportation R

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“…Results showed a superior performance achieved by lane-by-lane detection for high-volume traffic and significant differences between the two schemes did exist for certain signal cycles. In addition to an improvement in capacity, lane-by-lane advance detection at a signal high-speed intersection can significantly reduce the probability of max-out and thus increase the safety of the high-speed intersection ( 14 – 16 ).…”

Section: Literature Reviewmentioning

confidence: 99%

An Improved Inductive Loop Detector Design for Efficient Traffic Signal Operations and Leaner Space Requirements

Yogesh

Sharma

Vanajakshi

2018

Transportation Research Record: Journal of the Transportation R

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Inductive loop detectors (ILDs) are one of the most widely deployed traffic sensors. At present, for lane-by-lane detection, ILDs require separate connecting cables for each loop (each lane) and separate data acquisition systems or detector channels to process them. This becomes problematic with limited conduit and cabinet space. In most cases, transportation agencies use ILDs connected in series to avoid these constraints, in which case the lane-by-lane information is lost. However, research has shown that lane-by-lane detection can lead to safer and more efficient operations at signalized intersections. In order to ease the application of lane-by-lane detection, the current study proposes a solution that uses electronic circuit modification to convert the existing serially connected loops to carry out lane-by-lane detection. This system achieved 100% accuracy of lane-by-lane detection in test runs. The paper also proposes an improved loop design, for future installations, that can be used for vehicle classification and wrong way detection. The study implemented machine-learning algorithms for vehicle classification and direction determination with an accuracy of 99.6% and 78.57%, respectively, using single loop configuration.

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“…More recent studies have explored the use of wide-area detectors to provide real-time information for signal control, including dilemma zone protection (16)(17)(18). Each of these studies showed the potential for using dynamic dilemma zone protection to improve the safety and efficiency of a target intersection.…”

Section: Literature Reviewmentioning

confidence: 99%

Design and Evaluation of an Intelligent Dilemma-Zone Protection System for a High-Speed Rural Intersection

Chang

Franz

Liu

et al. 2013

Transportation Research Record: Journal of the Transportation R

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This paper presents the design and evaluation of a dilemma-zone protection system that uses dynamic detection technology to track individual vehicles as they approach an intersection of interest. A high-speed rural intersection in Maryland experiencing a high crash frequency was selected for system installation and evaluation. Data were collected from three sensors designed specifically for tracking individual vehicles and deployed along the target approach. The sensors were used in real time to control the signal logic and provided green or all-red extensions when the predefined parameters of detected vehicles were met. A field test was conducted to evaluate the performance of the system design and the effectiveness of the associated parameters. The data analysis included the identification of falsely called red extensions (related to efficiency) and missed red extensions (related to safety) to assess the overall performance of the newly installed system. The field observation results indicate that the newly designed dynamic dilemma-zone protection system using an all-red extension offers distinct advantages over traditional systems by providing additional protection to highspeed vehicles even when they are in the “cannot go” zone and make an incorrect decision to go.

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Improving Safety and Mobility at High-Speed Intersections with Innovations in Sensor Technology

Cited by 15 publications

References 10 publications

Using Connected Vehicle Data to Reassess Dilemma Zone Performance of Heavy Vehicles

Using Connected Vehicle Data to Reassess Dilemma Zone Performance of Heavy Vehicles

An Improved Inductive Loop Detector Design for Efficient Traffic Signal Operations and Leaner Space Requirements

Design and Evaluation of an Intelligent Dilemma-Zone Protection System for a High-Speed Rural Intersection

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