Sign up for an Award
Participate with your entry in one of our professional or student awards.Sign up for an award
You are using an outdated browser. Please upgrade your browser to improve your experience.
When my car broke down on the highway,it was dangerous to leave the car to put the warning sign about 20m behind the car. The safe warning sign makes people operate it near the car safely. You can push the warning sign which has four wheels to the place you want to put. And you can rotate the handle to get back the warning sign through the belt.
Tang Zhichuan, Cao Hongxin, Shen Jiaoqi, Zeng Xianwei