Palfrey used in a sentence

Palfrey in a sentence as a noun

A car with the intelligence of a palfrey---enough to not run into things, and maintain a smooth ride regardless of terrain/environment----would be an amazing luxury vehicle.

"A car with the intelligence of a palfrey---enough to not run into things" The transition into a world with only self-driving cars brings up the issue of pedestrians and other drivers with malicious intent. Your car is going 120km/h and someone purposefully jumps in front of the car; what does the car do?