This is also why car dependent infrastructure is a bad thing for Americans’ freedom.
You have more civil rights as a pedestrian than you do in a licensed motor vehicle.
Facial recognition has been used in train stations, unfortunately
Pedestrians are limited to a ~20 mile radius.
Travelling further, without a car, then requires use of public transportation and by using public transportation depending where you are you have implied consent to being searched "for safety".
Acknowledging civil asset forfeiture is a problem in some jurisdictions, private automobiles still provide a greater expectation of privacy than public modes of transport.
Facial and gait recognition tech make the pedestrian vs car point moot.