The following highways are numbered 1A:
EO1a road, remnants of the realigned Athens–Thessaloniki–Evzonoi road that were not upgraded to the A1 motorway 
New Zealand State Highway 1A (former)
National Route 1 (Vietnam), also known as National Route 1, a road connecting the northernmost and southernmost areas of the country
There are many roads in the southwestern part of British Columbia and Vancouver Island that were designated as Highway 1A. These roads were sections of the original 1941 route of Highway 1 before its various re-alignments, and are used today as service routes and frontage roads. The "B.C. Highway 1A" designations were removed from these sections by the province between 2005 and 2010, although signage remains along some of the route and the designation on some maps.
U.S. Route 1A (US 1A) is the name of several highways found in the United States.
