Could a Car-Sonar Perimeter Shield Police From an Ambush?

All-new 2020 Police Interceptor Utility, with standard hybrid all-wheel-drive powertrain, will save police agencies and taxpayers as much as $5,700 per vehicle annually in fuel costs* over current Police Interceptor Utility equipped with 3.7-liter gas engine

A perimeter sensing system might have warned in advance the two California deputies who were shot.