How are exits numbers for interchanges determined?
Exit numbers are sequential starting at “1” from the southern (for north-south highways) or western (for east-west highway) commencement of the highway. For interchanges with 2 exits, the number is suffixed with an “A” for the first exit (traveling in a northbound or eastbound direction) followed by a “B” for the second. Therefore motorist traveling in the opposite direction (southbound or westbound) will see e.g. “EXIT 2B” followed by “EXIT 2A.
