Traffic alert, from the City of Sunnyvale:

Overnight Mathilda Bridge Closure
Caltrans will close all southbound lanes and all but one northbound lane of the Mathilda Avenue Bridge over U.S. 101 from 8 p.m. Monday, February 8, to 5 a.m. the following morning. The roadway will be re-striped in preparation for the repair construction work that will take place later. CHP will provide traffic control.

This is to fix the damage caused by someone driving underneath the bridge with inadequate clearance back in, um, October, I think.