At a four-way stop every vehicle must come to a complete halt before proceeding one at a time across the intersection, regardless of whether there is any other traffic in sight or not.
If two or more vehicles draw up to one of these junctions and stop, waiting to proceed across it, then they should proceed in the same order in which they arrived. If two vehicles arrive at one of these junctions at precisely the same time, so that it is impossible to tell which arrived first, then in theory the vehicle on the right has priority. However, many drivers are unaware of this rule and there are complications due to all the possible permutations of turns.
—JOHN CLETHEROE,
Driving in the USA and Canada
www.johncletheroe.org/usa_can/
