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Deaf: Members of the American Deaf community, who use ASL as their primary mode of communication, often prefer capital D spelling. Other deaf people who use residual hearing or a different sign system than ASL may prefer to use small d spelling. See also: American Sign Language, Sign Language, Interpreter

Design width: The width specification that a sidewalk or trail was designed to meet. For sidewalks, the design width extends from the curb to any buildings or landscaping that forms the opposite border of the sidewalk. For trails, the design width is the area generally considered part of the trail (the beaten path or tread width).

Detectable warning: A standardized surface feature built in or applied to walking surfaces or other elements to warn people with visual impairments of hazards.

Diagonal curb ramp: A curb ramp positioned at the apex of an intersection.

Diagonal technique: An environmental scanning technique where a visually disabled person holds a cane diagonally across the body in a stationary position, with the cane just above or touching the ground at a point outside one shoulder, and with the handle extending to a point outside the other shoulder. Used primarily in familiar, controlled environments.

Digital: Computer formatted data or information.

Disability: Physical or mental impairment that substantially limits one or more major life activities; a record of such an impairment; or being regarded as having such an impairment (Americans with Disabilities Act of 1990).

Discrimination: Act of making a difference in treatment or favor on a basis other than individual merit.

Drainage inlet: A site where water runoff from the street or sidewalk enters the storm drain system; the openings to drainage inlets are typically covered by a grate or other perforated surface to protect pedestrians.

Driveway crossing: A ramp positioned where a driveway and the sidewalk meet; designed to ease the transition between the street and driveway.

This page provides a glossary of terms for letters D through E.

Glossary of terms

D - E

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