The following highways are numbered 174:
Brazil BR-174
Canada Ottawa Road 174 Prince Edward Island Route 174
Costa Rica National Route 174
Ireland R174 road
Japan Route 174 (Japan) (Japan's shortest national highway)
United Kingdom road B174 road
United States Interstate 174 (proposed) Alabama State Route 174 California State Route 174 Connecticut Route 174 Georgia State Route 174 Illinois Route 174 (former) Kentucky Route 174 Louisiana Highway 174 Maine State Route 174 Maryland Route 174 M-174 (Michigan highway) Missouri Route 174 New Jersey Route 174 (former) New Mexico State Road 174 New York State Route 174 New York State Route 174X Ohio State Route 174 Pennsylvania Route 174 South Carolina Highway 174 Tennessee State Route 174 Texas State Highway 174 Texas State Highway Spur 174 Farm to Market Road 174 Utah State Route 174 Virginia State Route 174 Washington State Route 174 Wisconsin Highway 174 (former) Wyoming Highway 174 Territories: Puerto Rico Highway 174