Alert

When there is an alert, we will post information about it here.
 

 A green light means no current alerts:

 A yellow light means an alert like a road closure:

 A red light means a serious emergency:

If you haven't yet done so, please sign up to receive emergency alerts through the San Mateo County Alert System. Once signed up, you'll receive emergency notifications through e-mail and/or your mobile device via a text message.