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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 for SMCAlert, you'll receive emergency notifications through e-mail and/or your mobile device via a text message.

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