Add to ORKGHighway construction has intensified in recent years to address two challenges. First, the Nation's highway infrastructure is aging, because much of it was built during the 1950s and 1960s and needs to be rehabilitated or replaced. Second, although highway capacity has remained virtually unchanged during the past several decades, traffic demand has increased tremendously, causing high levels of congestion. Large construction projects to improve outdated roads and bridges compound traffic problems during extensive construction periods. Today's motorists demand high quality roads, but they want them put in place as quickly as possible; they will not settle for a "business as usual" approach