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.
Folks from Memphis are so proud of living in the Big-M that they built their newest bridge in the shape of a giant letter M. Nothing screams Memphis! quite the way the Hernando De Soto bridge does. The result is one of the most interesting spans to cross the mighty river.