| 摘要 |
A system for indicating approaching vehicle speed includes a transmitter for emitting a wireless signal. The transmitter is mounted on the vehicle. A receiver unit is adapted for detecting wireless signals emitted by the transmitter. A processor is operationally coupled to the receiver unit. The processor is adapted for determining a relative speed of the vehicle from signals received by the receiver unit. At least one display is operationally coupled to the processor for displaying the relative speed determined by the processor.
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