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The following guidelines pertain to coordinating regulatory VSL system installation and operation with law enforcement and the judicial system. This includes guidance on coordinating and collaborating with law enforcement, determining legal authority, and maintaining a system log for evidence of potential violations.
This chapter provides guidelines for developing a comprehensive concept of operations for a VSL system, determining where weather sensors are appropriate, ensuring that all necessary equipment is incorporated in the requirements, and developing an operations and maintenance plan.
This chapter provides design guidelines on setting appropriate speeds and other details related to speed limit signage and the development of algorithms for the use of VSL systems in wet weather. This chapter includes guidelines for determining the appropriate type of VSL system to use, setting appropriate speed limits for VSLs, and determining the display and locations of VSL signs.
A driver is continuously balancing three main tasks: control, guidance, and navigation. Control refers to all activities involved in the driver's interaction with the vehicle. The driver receives control information from the vehicle's displays, from the "feel" of the vehicle, and from the roadway.
The purpose of any speed limit sign is to inform drivers of the maximum acceptable and safe speed for normal travel conditions. However, if roadway conditions are less than ideal, such as during wet weather conditions, conventional static speed limit signs may not display an appropriate, reasonable, and/or safe speed limit for those conditions.
FHWA Safety Program
FHWA-SA-12-022
August 24, 2012
Bike Safe – Bike Smart, https://www.youtube.com/watch?v=uBGW8j__Jsg
Context Sensitive Solutions website – http://contextsensitivesolutions.org/
| Name | Organization | Role |
|---|---|---|
| Peter Eun | FHWA Resource Center | Safety & Design Team – Pedestrian and Bicyclist expert |
| Lauren Blackburn | North Carolina DOT | TRB Standing C |
Understanding the current state of the practice can help practitioners both to identify gaps and needs within an agency's speed management policies and practices as well as to select successful strategies for addressing speed-related crashes.
"NHTSA considers a crash to be speeding-related if the driver was charged with a speeding-related offense or if an officer indicated that racing, driving too fast for conditions, or exceeding the posted speed limit was a contributing factor in the crash."
National Highway Traffic Safety Administration