"This advisory circular (AC) contains performance standards, specifications, and recommendations for DEVS [Driver's Enhanced Vision System]. [...] For airport operating certificate purposes, Aircraft Rescue and Fire Fighting (ARFF) vehicles must demonstrate an emergency response time of 3 minutes to a simulated accident on an airport runway, with the goal to get to the accident site in as little time as possible. During periods of poor visibility, ARFF response times tend to increase. The Driver's Enhanced Vision System (DEVS) program, in an effort to reduce response times, is aimed at the four difficult aspects of poor visibility response: (1) locating the accident, (2.) navigating to the accident site, (3.) avoiding obstacles, (4) locating people on the way to the accident site."
United States Federal Aviation Administration: http://www.faa.gov