a safety device is disclosed for cautioning passing motorists or pedestrians to the presence of a vehicle . one embodiment has a mount and a rigid standard affixed to the mount . the standard is extensible in length . the standard has at least a first section moving in relation to a second section to extend the length of the standard . another embodiment of the standard telescopes in length to enhance visibility . this embodiment of the standard has a tubular cross - section and an inner section sliding within an outer section . the safety device attaches to the vehicle and cautions passing motorists or pedestrians .