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When the car is towed by a tow truck, it is dangerous because the towed car usually can’t display any signals even for turn or stop to the following drivers. The new design, Portable Alert, is a portable and wireless signal device. They can be attached on the rear sides of the towed car. When the tow truck turns or stops, the information is acquired by the sensors of the new devices and simultaneously display the correct signals as the tow truck. With the Portable Alert, we can avoid some traffic accidents and keep safer for the following cars.