Abstract: The invention provides a device which includes a bracket to be firmly embedded in a driveway; and includes a post which is adapted to be slidably seated in the bracket in a vertical position to serve as an obstruction to passage of a motor vehicle from the driveway. An Ell-rod provided in the post is manually operable to interlock the post against removal from the bracket, and is adapted to be locked in the interlocked condition by a padlock. The ell-rod is manually operable upon removal of the padlock to release its interlocked condition so as to allow removal of the post from the bracket to enable vehicle passage over the driveway.