01045985

Component

https://doi.org/10.3141/2030-09

http://scholar.google.com...echt&publication_year=2007

There were two concurrent paths in this research. Path 1 estimated the probability, p sub vehicle/train, that a vehicle will be in the train dynamic envelope given that a train arrives. This was done by an extensive simulation effort that included some data collection on relevant gap acceptance patterns. Path 2 identified the exposure factors, selected a risk metric, and established a target or threshold for the risk, which is expressed as an upper bound on p sub vehicle/train. As a result of the investigation, the warrant is based on the principle that the expected fatality rate at the crossing should not exceed rates found at unsignalized intersections. The two paths converged by expressing the constraint p sub vehicle/train ≤ __ (where __ is in terms of traffic terms in common use—e.g., volumes, composition, track location distances). This constraint led to the warrant, which was then validated with data acquired or collected for the purpose. The draft warrant was prepared as a result of the undertaking, was endorsed by the National Committee on Uniform Traffic Control Devices, and is currently in the formal review process, culminating in final edits and a decision on inclusion in the next edition of the "Manual on Uniform Traffic Control Devices."

01089673

English

pp 59-68

2007

Transportation Research Record: Journal of the Transportation Research Board

9780309104579

Print

Figures (6) ; Photos (3) ; References (24) ; Tables (2)

Crash exposure; Gap acceptance; Metrics (Quantitative assessment); Probability; Railroad grade crossings; Risk assessment; Simulation; Traffic signals; Warrants (Traffic control devices)

Manual on Uniform Traffic Control Devices

Proximity

Data and Information Technology; Highways; Operations and Traffic Management; Railroads; Safety and Human Factors; I73: Traffic Control

TRIS, TRB, ATRI

Feb 8 2007 6:51PM

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• Factors That Influence the Effectiveness of Rumble Strip Design
• Guidelines for Minimum Signal Sight Distance
• Preferences for Headlight Swivel Angles at Curves on Rural Two-Lane Highways
• Reducing Undesirable Actions of Motor Vehicle Drivers at Railroad-Highway Grade Crossings
• Traffic Control Devices and Barrier Systems at Grade Crossings: Literature Review
• Urban Wayfinding Signs: Evaluating Exceptions to FHWA’s Standard Alphabets
• US-36 Environmental Impact Statement and Basic Engineering: Methodology of Grade Crossing Evaluation