A threshold condition that, if found to be satisfied as part of an engineering study, shall result in analysis of other traffic conditions or factors to determine whether a traffic control signal or o [..]

A device that communicates information about pedestrian timing in nonvisual format such as audible tones, verbal messages, and/or vibrating surfaces. (MUTCD)

A type of traffic control signal operation in which some or all signal phases are operated on the basis of actuation. (MUTCD)

Initiation of a change in or extension of a traffic signal phase through the operation of any type of detector. (MUTCD)

Either a light, a tone, a voice message, or both audible and visual indicators that indicate to pedestrians that the button press has been accepted.

A very brief burst of high frequency sound, rapidly decaying to a 500 Hz WALK tone, to alert pedestrians to the exact onset of the WALK interval.

See Accessible pedestrian signal.

Use of a sound source to provide directional orientation and alignment information.

An APS volume control that is automatically responsive to ambient (background) sound; automatic gain control.

Provision of the name of the associated street in Braille above the APS pushbutton.