The following highways are numbered 342:
Australia - Lockington Road
Canada Manitoba Provincial Road 342 Newfoundland and Labrador Route 342 Prince Edward Island Route 342 Quebec Route 342 Saskatchewan Highway 342
Japan Japan National Route 342
Nigeria A342 highway (Nigeria)
United Kingdom A342 road, Chippenham, Wiltshire to Andover, Hampshire
United States Arkansas Highway 342 Florida: County Road 342 (Gilchrist County, Florida) County Road 342 (Leon County, Florida) Georgia State Route 342 (former) Indiana State Road 342 Louisiana Highway 342 Maryland Route 342 Nevada State Route 342 New York: New York State Route 342 New York State Route 342 (former) Ohio State Route 342 Puerto Rico Highway 342 Tennessee State Route 342 Texas: Texas State Highway 342 Texas State Highway Spur 342 Virginia State Route 342 Wyoming Highway 342