SR 99: Automated Closure Gates
From WSDOT:
http://www.wsdot.wa.gov/projects/sr99/viaductclosuresystem/
This project will build gates at all on ramps to the viaduct that will automatically close in the event of an earthquake. Since currently it can take up to 2 hours to close the viaduct (in a minor event), this is very important. There is a definite risk of collapse until the viaduct has been replaced. Keeping traffic off the viaduct in an earthquake event will be very important.
Ben