The Bay Area GTFS Accessibility site validates the accessibility fields of all 40 Bay Area transit agencies.

It checks for:

• wheelchair_accessible field in trips.txt
• wheelchair_boarding field in stops.txt
• tts_stop_name field in stops.txt
• levels.txt file
• pathways.txt file
• Contrast ratio between route_color and route_text_color in routes.txt

These accessibility guidelines are taken from the California Transit Data Guidelines published by Caltrans.

It uses the GTFS Accessibility Validator tool.