Can traffic laws be enforced on private property?

If you come across a stop sign, speed limit sign, or traffic light that appears to be legally placed, even on private property, by all means, accept it. The Pennsylvania Department of Transportation and the Pennsylvania State Police team up to remind you of lesser-known state laws. Some state traffic laws don't apply to driving on private property, but drivers can be charged with serious traffic violations, such as reckless driving, negligent driving, and driving under the influence of alcohol. Some private communities can also do their own traffic law enforcement, such as the gated Birch Bay Village neighborhood in Whatcom County of Washington, where private security officers enforce traffic regulations and issue tickets.

In Washington, officers can enforce traffic violations, such as reckless driving, negligent driving, vehicular homicide, and hit-and-run traffic collisions on private property. In other states, DUI law is more broadly drafted, but courts have interpreted the laws to apply to private property.