Test air leakage rate: With a fully-charged air system (typically 125 psi), turn off the engine, release the service brake, and time the air pressure drop. The loss rate should be less than 2 psi in 1 minute for single vehicles and less than 3 psi in 1 minute for combination vehicles.
Construction on the Coronado Bridge began in 1967. Almost 500 prestressed concrete piles were fastened to the sea floor of the bay to provide the foundations for the bridge. The steel and concrete components were largely built offsite, then assembled together from marine construction barges over the bay.
Bridges of the Toll Bridge Program. 1  Antioch Bridge. The original Antioch Bridge, a two-lane lift span, was the first toll bridge built across a San Francisco Bay tributary. 2  Benicia-Martinez Bridge. Located 30 miles north east of San Francisco, the Benicia-Martinez Bridge has been determined to be a Lifeline bridge in an event of a disaster. This link will show the various activities associated with the Benicia-Martinez Bridge, including contracts, photos, and other links related to the bridge.