Transit alerts have to work for riders who are moving, distracted, using a small screen, or navigating with assistive technology. Accessibility is not a cleanup step after the alert is written. It is part of whether the information reaches the people who need it.
Write the critical fact first
Begin with the service affected and the action to take. “Route 10: board at the temporary stop on King Street today” is more useful than “Important service update.” A screen reader user should be able to understand the subject from a heading or link list without listening through a full paragraph.
Use words as well as visual signals
- Do not rely on red, yellow, or green alone to communicate severity.
- Give icons a text label or accessible name.
- Use descriptive links such as “View Route 10 detour map,” not “Click here.”
- Keep status, route, date, and rider instruction together in the card or notice.
- Check that keyboard users can reach every linked detail and close every modal.
Respect the mobile reading order
On a phone, a dense alert table can become a wall of tiny text. A stacked card or short list is often easier to scan. The information order should remain logical when the layout changes: status, affected service, what changed, when, then the action.
Accessible alerts are usually better alerts for everyone. They are clearer, shorter, and less dependent on a rider seeing one color, one icon, or one precise screen layout.