| 摘要 |
An emergency warning system for buses, trucks or other vehicles. The system warns a driver of a potentially dangerous condition such as the approach of a train at a railroad crossing or the approach or presence of an emergency vehicle such as an ambulance, fire truck or police unit. A dedicated radio or other frequency is transmitted directly to to the bus or vehicle and a warning light and audible warning sound is generated. Multiple dedicated frequencies may be utilized in the system.
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