The NJDOT Straight Line Diagram for County Route 615 shows East Brunswick on the south side of the new bridge over the South River. Heading north from that bridge (the road is designated North-South), Sayreville is to the west, Old Bridge to the east, with the roadway being the division line. CR-615 is the division line between Sayreville and Old Bridge all the way up to Ernston Road, where it becomes all Sayreville.
But where were they going without ever knowing the way?