| 摘要 |
The device has means (10-13), mounted on each wheel, which determines the angle of orientation of each wheel (1-4). The device has at least a light emitting source (14,15) fixed to a front wheel (1,2) of the vehicle, in a position designed to be continuously detected in a range of extended angles by a sensor (3,4) mounted on a rear wheel (3,4). At least one of the light emitters is an active source such as an electro-luminescent diode. At least one of the light emitters is a passive source such as a retro-reflector.
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