Portable traffic warning sign is for traffic accident scenes, security checkpoints, drunk driving inspections, and various emergencies. Features 1. Foldable, use linkage system, flexible retractable 2. With pneumatic lifting function 3. Eight-shaped base support frame, wind-resistant design, open with one click. 4. With wheels and handles, easy to carry 5. Equipped with warning lights and display 6. Built-in black box and high-definition camera (optional)