In the 1990s, high-occupancy vehicle lanes were built along I-80 between Rockaway and Parsippany. These HOV lanes, along with the ones that had been built on I-287, were opened to regular traffic in 1998 due to lack of usage, and the state did not have to repay the federal government the $240 million to build the lanes. On June 22, 2001, a tanker crashed on a westbound bridge on I-80 in Denville, causing a fiery explosion that damaged the bridge and forced its demolition. A temporary bridge had to be built and traffic on this part of I-80 as well as adjacent roads was snarled; in addition, a state of emergency had been declared for Morris County. The new I-80 bridge opened in September 2001.