Having a continuous edge within 6 inches of the surface so that pedestrians who have visual disabilities can sense its presence and receive usable guidance information.

A device used for determining the presence or passage of vehicles or pedestrians. MUTCD 2009 Edition with May 2012 Revisions 1 and 2

The longitudinal distances between channelization devices (cones, tubular markers, drums) in a taper or along tangent sections of the work and buffer spaces.

A term that refers to a location that is encountered by traffic subsequent to an upstream location as it flows in an "upstream to downstream" direction. For example, "the downstream end of a lane line separating the turn lane from a through lane on the approach to an intersection" is the end of the lane line that is closest to the intersection. MUTCD 2009 Edition with May 2012 Revisions 1 and 2

A through lane that becomes a mandatory turn lane on a conventional roadway, or a through lane that becomes a mandatory exit lane on a freeway or expressway. The end of an acceleration lane and reductions in the number of through lanes that do not involve a mandatory turn or exit are not considered dropped lanes. MUTCD 2009 Edition with May 2012 Revisions 1 and 2

Lightweight, flexible, and deformable barrel-shape channelization devices used to temporarily redirect traffic traveling through a work zone or incident response area. Drums can be used in tapers and along tangent areas to separate traffic from a work space and guide traffic along a desired path. MUTCD 2009 Edition with May 2012 Revisions 1 and 2

A type of signal section designed to include both a yellow arrow and a green arrow. MUTCD 2009 Edition with May 2012 Revisions 1 and 2

The clearance required for light rail transit traffic or a train and its cargo overhang due to any combination of loading, lateral motion, or suspension failure (see Figure 8B-8). MUTCD 2009 Edition with May 2012 Revisions 1 and 2

A mode of operation where the exit gate operation is based on the presence of vehicles within the minimum track clearance distance. MUTCD 2009 Edition with May 2012 Revisions 1 and 2