Captioned film or videos: Transcription of the verbal portion of films or videos displayed to make them accessible to people who are hard of hearing, deaf, or learning disabled. If the captions can be turned on an off, they are called Closed Captions. If they are always visible on the screen, as in subtitles to non-English movies, they are called Open Captions.

Captioning (Real-Time, CART): Text that is typed and displayed as an event is in progress, such as at a lecture or theatrical production.  This enables hard of hearing or deaf people to have access to the audio portion of the material.  Sometimes called CART for Computer Aided Real-time Transcription.

Caster: A wheel that can pivot but is not intended to govern the driving direction; typically used for the front wheels of most wheelchairs and strollers.

Change of cross slope: An abrupt difference between the cross slope of two adjacent surfaces. A rapid rate of change of cross slope is frequently found on driveway crossing flares and curb ramps without landings. A cross slope that changes so rapidly that there is no planar surface over 0.6 m2 (24 in2) can create a safety hazard.

Change of grade: An abrupt difference between the grade of two adjacent surfaces.

Changes in level: Vertical height transitions between adjacent surfaces or along the surface of a path. Small changes in level are often caused by cracks in the surfacing material. Changes in level may also result when the expansion joints between elements such as curb ramps and gutters are not constructed at the same time. On trails, ruts caused by weather erosion, tree roots, and rocks protruding from the trail surface are common sources of changes in level.

Charrette: An intensive 1-5 day workshop involving members of a community discussing planning issues, interrelationships, and impacts, and creating their own vision for a project, corridor, neighborhood, or community.

Clear space in crosswalk: The additional space required to be included in a crosswalk at the corner where the ramp of a diagonal curb ramp meets the street, so that those entering or exiting the base of the ramp can remain within the crosswalk.

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