WZSC Glossary


WZSC Glossary composed of MUTCD, NIOSH, OSHA, AASHTO
Browse the glossary using this index

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C

Crosswalk

(a) That part of a roadway at an intersection included within the connections of the lateral lines of the sidewalks on opposite sides of the highway measured from the curbs or in the absence of curbs, from the edges of the traversable roadway, and in the absence of a sidewalk on one side of the roadway, the part of a roadway included within the extension of the lateral lines of the sidewalk at right angles to the center line; (b) Any portion of a roadway at an intersection or elsewhere distinctly indicated as a pedestrian crossing by pavement marking lines on the surface, which might be supplemented by contrasting pavement texture, style, or color. MUTCD 2009 Edition with May 2012 Revisions 1 and 2

Crosswalk Lines

White pavement marking lines that identify a crosswalk. MUTCD 2009 Edition with May 2012 Revisions 1 and 2

Cycle Length

The time required for one complete sequence of signal indications. MUTCD 2009 Edition with May 2012 Revisions 1 and 2

D

Dark Mode

The lack of all signal indications at a signalized location. (The dark mode is most commonly associated with power failures, ramp meters, hybrid beacons, beacons, and some movable bridge signals.) MUTCD 2009 Edition with May 2012 Revisions 1 and 2

dBA

A-weighted decibels

Decision Sight Distance

The distance required for a driver to detect an unexpected or otherwise difficult-to-perceive information source or hazard in a roadway environment that may be visually cluttered, recognize the hazard or its potential threat, select an appropriate speed and path, and initiate and complete the required safety maneuver safely and efficiently. See also Sight Distance, Stopping Sight Distance, Passing Sight Distance, and Intersection Sight Distance.


Delineator

A retroreflective device mounted on the roadway surface or at the side of the roadway in a series to indicate the alignment of the roadway, especially at night or in adverse weather. MUTCD 2009 Edition with May 2012 Revisions 1 and 2

Design Speed

A selected speed used to determine the various geometric design features of a roadway. MUTCD 2009 Edition with May 2012 Revisions 1 and 2

Design Vehicle

The longest vehicle permitted by statute of the road authority (State or other) on that roadway. MUTCD 2009 Edition with May 2012 Revisions 1 and 2

Designated Bicycle Route

A system of bikeways designated by the jurisdiction having authority with appropriate directional and informational route signs, with or without specific bicycle route numbers.


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