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.
The Bridge: The Building of the Verrazano-Narrows Bridge. Toward the end of 1964, the Verrazano Narrows Bridge-linking the New York City boroughs of Brooklyn and Staten Island-was completed. Fifty years later, it remains an engineering marvel. When it was finished, a ride across cost drivers 50 cents, or the equivalent of less than $4.