About this item Function: The portable speed bump can be used to control traffic flow in asphalt, gravel and uneven surface in roads, garage, driveway, and neighborhood. Specification: The speed bump total unrolled size measures 112.8” (9.4ft) length and 8.78” width. Bright yellow makes the speed bump highly visible while using. Installation: The speed bump for driveway can be easily set up in only seconds to slow down the vehicle. Portable Design: With the carry bag, you can store it in your car trunk and set up the speed bump whenever you need. Provided Bump Sign: Sign Length: 18″, width: 12″, quantity: 1. The slow speed bump signs can remind drivers to slow down and stay alert to ensure driving safety. High Quality: Made of high quality polypropylene, which is durable, temperature resistant, and compression resistant.