The following highways are numbered 172: Canada New Brunswick Route 172 Prince Edward Island Route 172 Quebec Route 172 Ireland R172 road Japan Japan National Route 172 United States Interstate 172 (former) Interstate 172 Alabama State Route 172 Arizona State Route 172 (former) California State Route 172 Colorado State Highway 172 Connecticut Route 172 Georgia State Route 172 Illinois Route 172 Kentucky Route 172 Louisiana Highway 172 Maine State Route 172 Maryland Route 172 M-172 (Michigan highway) (former) Minnesota State Highway 172 Mississippi Highway 172 Missouri Route 172 Nevada State Route 172 New Jersey Route 172 New Mexico State Road 172 New York State Route 172 North Carolina Highway 172 Ohio State Route 172 Pennsylvania Route 172 (former) South Carolina Highway 172 Tennessee State Route 172 Texas State Highway 172 Texas State Highway Loop 172 Texas State Highway Spur 172 Farm to Market Road 172 (Texas) Utah State Route 172 Virginia State Route 172 Washington State Route 172 Wisconsin Highway 172 Wyoming Highway 172 Territories: Puerto Rico Highway 172