36 CFR Part 1192 Americans with Disabilities Act (ADA) Accessibility Guidelines for Transportation Vehicles (2016 Non-Rail Vehicle Guidelines)

T704.2.1 Audible and visible notification.

Audible and visible notification shall be provided onboard indicating when passengers have requested to disembark at the next stop on the fixed route. Audible notifications shall be verbal or non-verbal signals and sound only once for each stop. Visible components of stop request systems shall include signs complying with T702, lights, or other visually perceptible indicators. Visible components shall illuminate or activate with a stop request, be viewable onboard from all wheelchair spaces and priority seats for passengers with disabilities, and extinguish when the doors open at a stop on non-rail vehicles.