Important: The images in this article are from Google Maps on Android. The interface for Maps on Desktop and iOS might display differently.
There are 3 main alert categories in Google Maps:
- Critical
- Warning
- Informational
Each category appears differently. They're determined by the effect field.
Categorize alerts
Please use caution when using the NO_SERVICE effect, as this will cause all trips specified in the alert entities to be canceled. See Cancel trips with Alert for more information.
| Effect | Alert category |
Alert icon |
Alert text | Alert color |
|---|---|---|---|---|
NO_SERVICE |
Critical |  |
No service | Red |
SIGNIFICANT_DELAYS |
Critical | |
Significant delays | Red |
REDUCED_SERVICE |
Warning |  |
Reduced service | Orange |
DETOUR |
Warning | |
Detour | Orange |
MODIFIED_SERVICE |
Warning | |
Modified schedule | Orange |
STOP_MOVED |
Warning | |
Stop moved | Orange |
ADDITIONAL_SERVICE |
Informational |  |
Extra service | Blue |
OTHER_EFFECT /UNKNOWN_EFFECT |
Informational | |
Information | Blue |
Medical emergency messaging
Agencies can create messages for medical emergencies. Set the value of the cause field to MEDICAL_EMERGENCY and the value of the effect field to OTHER_EFFECT.
Where & how alerts display
Alerts are currently represented in different ways and show up in 5 different areas on Google Maps.