| 摘要 |
Devices and methods for detecting the presence of and evaluating the approach to obstacles situated in the path of articles attached to the roof of a vehicle and alerting the driver of the vehicle when an impact or collision between the articles and the obstacles is likely to occur. An example device includes an ultrasonic transducer and circuitry to measure the distance to obstacles, an audible warning device, a microprocessor to perform such tasks as controlling the generation of ultrasonic pulses, measuring the echo delay, calculating the risk of collision, and signaling the warning device, and a housing which protects the components of the device and can be quickly and easily attached to and detached from the vehicle.
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