Highway18A was a short route that served the headland that protrudes into Lake Erie between Amherstburg and Kingsville in the southernmost part of Essex County. It began and ended at junctions with the former Highway18, now Essex County Road 20, that are approximately  apart on that road.
Highway18A was a short route that served the headland extending into Lake Erie between Amherstburg and Kingsville in southern Essex County. It began and ended at points where it met former Highway18, now known as Essex County Road 20, which are approximately the same distance apart on that road.