The following highways are numbered 178: Canada Prince Edward Island Route 178 Japan Japan National Route 178 United States Interstate 178 (former proposal) U.S. Route 178 Alabama State Route 178 Arkansas Highway 178 California State Route 178 Connecticut Route 178 Georgia State Route 178 Illinois Route 178 K-178 (Kansas highway) Kentucky Route 178 Louisiana Highway 178 Maine State Route 178 Maryland Route 178 M-178 (Michigan highway) (former) Mississippi Highway 178 New Jersey Route 178 (never built) New York State Route 178 Pennsylvania Route 178 (former) Tennessee State Route 178 Texas State Highway 178 Texas State Highway Loop 178 Farm to Market Road 178 (Texas) Utah State Route 178 Virginia State Route 178 Wisconsin Highway 178 Territories Puerto Rico Highway 178