Colorado officials shut down all lanes of Interstate 70 and U.S. Highway 40 between the Morrison and Lookout Mountain exits on Wednesday after a westbound semitrailer caught fire and began leaking what authorities described as an acid-based hazardous material. The Colorado State Patrol, which is leading the response, said the truck driver escaped injury and is cooperating with troopers. Hazmat teams from the state transportation department and local agencies are working to contain the spill and assess roadway damage. Authorities have not provided an estimate for when the key mountain corridor west of Denver will reopen, and they are urging motorists to avoid the area and seek alternate routes.