The CO2 car stopping concept worked out. I wonder if a liquid nitrogen dump would be possible with less technology.

A specialize dewars sitting in the trunk with a bottom feeding dip tube could lay down a field of O2 depleting liquid/gas.

Because the nitrogen is a liquid it could be sprayed directly on the radiator in a concentrated stream, unlike the diffuse CO2 system.

scratch the part of the comment that said....the CO2 concept worked....I figured you guys would ultimately pull it off. I feel certain the N2 will do the trick. It will not become diffuse like the CO2 did.