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.
From the 1952 to 1972, the Goethals Bridge carried Route 439 from New Jersey to New York. The I-278 designation was added to the bridge in 1958, when the Interstate was routed through Staten Island via the Goethals Bridge and the (then-proposed) Verrazano-Narrows Bridge.