The following highways are numbered 1A:
Canada Alberta Highway 1A British Columbia Highway 1A Manitoba Highway 1A Prince Edward Island Route 1A
Germany Bundesstraße 1a, a German road
Greece EO1a road, remnants of the realigned Athens–Thessaloniki–Evzonoi road that were not upgraded to the A1 motorway
India
Laos Route 1A (Laos)
New Zealand New Zealand State Highway 1A (former)
Switerland A1a motorway (Switzerland)
United States U.S. Route 1A Delaware Route 1A Massachusetts Route 1A New Hampshire Route 1A New York State Route 1A (former) Rhode Island Route 1A Secondary State Highway 1A (Washington) (former)
Vietnam National Route 1 (Vietnam), also known as National Route 1, a road connecting the northernmost and southernmost areas of the country
See also Florida State Road A1A List of highways numbered 1