[Travis McGee]

On 2nd thought it won't fly. Such a system runs counter to the enviro dream of totally connected wilderness zones, with field mice and grizzlies roaming in continuous forest land corridors from Canada to Mexico. That is Holy Writ to them.

Consider Camp Pendleton Marine Base between San Diego and LA. In time of war, with Marines facing combat, the enviros permit the Marines to practice amphibious operations on 500 feet out of 17 miles of the base's coastline, lest the brutal ugly jarheads disturb the Lesser Western Green Throated Blue Balled Sand Flea.

[Mr_Magoo]

Speculation:

A car would not even need to stop if highway safety flares were lit and tossed out the window . . .