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.
In 1990, however, the bridge was damaged by floods. In 1999, the DPWH restarted work with a plan to construct the bridge on another portion of the Abra River. The bridge was finally completed on March 25 this year. DPWH officials said the bridge allowed faster and safer transport of people and goods between the Ilocos and the Cordillera regions.