Transportation agency: A federal, state, or local government entity responsible for planning and designing transportation systems and facilities for a particular jurisdiction.

Transportation enhancement: Projects that enhance the transportation network, including providing bicycle and pedestrian facilities; converting abandoned railroad rights-of-way into trails; preserving historic transportation sites; acquiring scenic easements; and mitigating the negative impacts of a project on a community by providing additional benefits.

Transportation Equity Act for the 21st Century (TEA-21): Federal legislation authorizing highway, highway safety, transit, and other surface transportation programs from 1998 through 2003.  It provides funding opportunities for pedestrian, bicycling, and public transit facilities and emphasizes intermodalism, multimodalism, and community participation in transportation planning.

Traumatic Brain Injury (TBI): Open and closed head injuries resulting in impairments in one or more areas, including cognition; language; memory; attention; reasoning; abstract thinking; judgment; problem-solving; sensory, perceptual, and motor abilities; psychosocial behavior; physical functions; information processing; and speech. The term does not apply to brain injuries that are congenital, degenerative, or induced by birth trauma.

Truncated domes: Small domes with truncated tops that are detectable warnings used at transit platforms, curb ramps, and hazardous vehicular ways.

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