| 摘要 |
Emergency Visual Alerting System (EVAS) is primarily a garage door opener type transmitter, with a receiver and antenna attached to a grid of LED lights that when activated flash on and off. EVAS can operate independently or integrated with the existing traffic signals. This system is also equipped with a battery backup that activates in the event of a power outage. Customers may elect to use only the battery backup system for power outages and not use the transmitter/receiver features.
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