Susan described the scenario. I'm at work when the big one hits and we lose a certain bridge and a number of overpasses. My truck in the parking lot clear from any vulnerable structures contains a couple kits which would be very beneficial.

It's only 25 miles with the bridge but it's 40 miles without it assuming the road is intact where it runs along the beach. After a large earthquake (Mag 8+) I would first wait for radio/TV news (we still get Mexican TV with rabbit ears) forget TV, that would require wall power, so after radio news I'll make a decision regarding staying, driving or walking home.

Meanwhile I'd probably drive to a friend's place and check up on them/check-in with them. That's about as close to a community shelter as I intend to get.