Evaluating the safety effectiveness of downgrade warning signs on vehicle crashes on Wyoming mountain passes

Moomen, Milhan; Rezapour, Mahdi; Raja, Mustaffa N.; Ksaibati, Khaled

doi:10.1080/23311916.2019.1580405

Cited by 6 publications

(2 citation statements)

References 15 publications

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“…Communication infrastructure improvements include static/dynamic warning signs and signals, pavement markings and incident warnings including queue detection at work zones and low visibility and/or high wind warnings. Studies have shown that these communication improvements have a significant impact on enhancing commercial truck safety [10]- [16]. However, deploying warning systems and dynamic message signs throughout the highway network is both expensive and challenging.…”

Section: Literature Reviewmentioning

confidence: 99%

Quantifying the Impact of In-Cab Alerts on Truck Speed Reductions in Ohio

Desai,

Mathew,

Bullock

2024

JTTs

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In-cab alerts warn commercial vehicle drivers of upcoming roadway incidents, slowdowns and work zone construction activities. This paper reports on a study evaluating the driver response to in-cab alerts in Ohio. Driver response was evaluated by measuring the statistical trends of vehicle speeds after the in-cab alerts were received. Vehicle speeds pre and post in-cab alert were collected over a 47 day period in the fall of 2023 for trucks traveling on interstate roadways in Ohio. Results show that approximately 22% of drivers receiving Dangerous Slowdown alerts had reduced their speeds by at least 5 mph 30 seconds after receiving such an alert. Segmenting this analysis by speed found that of vehicles traveling at or above 70 mph at the time of alerting, 26% reduced speeds by at least 5 mph. These speed reductions suggest drivers taking actional measures after receiving alerts. Future studies will involve further analysis on the impact of the types of alerts shown, roadway characteristics and overall traffic conditions on truck speeds passing through work zones.

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Section: Literature Reviewmentioning

confidence: 99%

Quantifying the Impact of In-Cab Alerts on Truck Speed Reductions in Ohio

Desai,

Mathew,

Bullock

2024

JTTs

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“…These changes have resulted in the speeds recommended by the GSRS being too conservative and, as a result, increasing the risk of truck drivers ignoring recommended speeds as unrealistic and disregarding the GSRS altogether, thus reducing downgrade safety. As a result of the above-mentioned factors, a study was commissioned by WYDOT to update the parameters of the GSRS ( 15 ).…”

Section: Literature Reviewmentioning

confidence: 99%

Incorporating Horizontal Curves and Roadway Geometry into the Automated Updated Grade Severity Rating System

Ampadu

Alrejjal

Ksaibati

2022

Transportation Research Record: Journal of the Transportation R

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Highway agencies all around the country, including the Wyoming Department of Transportation (WYDOT), have deep concerns about truck crashes resulting from brake temperatures exceeding the critical brake temperature as they descend steep downgrades. Through a series of research initiatives starting in the 1980s, WYDOT has developed a Grade Severity Rating System (GSRS) to estimate the maximum safe speed for trucks during downgrade descent. In 2020, the updated mathematical model was automated through an interactive, intuitive, aesthetically appealing, and user-friendly objected-oriented Visual Basic.net software. Additional research on the GSRS model was commissioned by WYDOT to account for large truck vehicle stability—specifically, rollovers and skidding/side slip during grade descent. These scenarios become relevant in the presence of horizontal curves. Consequently, this latest mathematical model has been automated to simplify the computation of maximum safe descent speed on the downgrades combined with curves, all based on the truck weight. As in the previous version of the software, it provides functionality for both the continuous slope and the separate downgrade method. The primary beneficiaries of the software will be highway agencies who will be able to estimate the maximum safe speed of descent for trucks descending downgrades with horizontal curves at various weight categories and therefore produce Weight Specific Speed (WSS) signs for each downgrade or multi-grade section.

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