A random checkpoint (also known as a "flying checkpoint", "mobile checkpoint" or "hasty checkpoint") is a military and police tactic involving the setup of a hasty roadblock primarily by mobile truck-mounted infantry or police units in order to disrupt unauthorized or unwanted movement and/or military activity.
Random checkpoints are set up to achieve surprise, as opposed to known permanently located manned checkpoints. They might be established in locations where they cannot be observed by approaching traffic until it is too late to withdraw and escape without being observed.