So you open a buisiness with a large parking lot, big enough that it gets a ton of traffic through it. You put up stop signs in front of the store and along the main drive ect. Are these stops enforcable by LEO? The Department of Transportation is who directs traffic and places signs for the public, and local LEO enforces them. But what about parking lot? Can you get a ticket for running a stop sign in the Wal-Mart parking lot that they put up? What if they are having cirtain problems and decide to add or remove them at their own discresion. Do they need DOT approval?