an automatically-operated or manually-operated traffic control device that is used to physically obstruct road users such that they are discouraged from proceeding past a particular point on a roadway or pathway, or such that they are discouraged from entering a particular grade crossing, ramp, lane, roadway, or facility. MUTCD 2009 Edition with May 2012 Revisions 1 and 2

The general area where a highway and a railroad and/or light rail transit route cross at the same level, within which are included the tracks, highway, and traffic control devices for traffic traversing that area. MUTCD 2009 Edition with May 2012 Revisions 1 and 2

a sign that shows route designations, destinations, directions, distances, services, points of interest, or other geographical, recreational, or cultural information. MUTCD 2009 Edition with May 2012 Revisions 1 and 2