If you break down on the bridge, you should stay with your car or use the nearest call box. Caltrans has a tow service which will tow your car off of the bridge at no charge to one of the drop points. Abandoned cars will get impounded (costing money) and likely brought to the 'West lot' which is not open to the public. There is an office building at the toll plaza parking lot (East lot).
Also call 511. For information it might be help.provide lic.no. an description of your vehicle an D.L. to confirm ownership. Hope this helps
Call caltrans they have a towing service. Idk there number. Hope you can get your car with minimal headache
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