Safety is definitely the tough part, and would probably require a new innovation in safety tech.

Maybe if you could find a way to create incredible traction between the tires and the road in emergencies you could stop faster and offset the G force when someone crashes into you.

Exterior airbags are also an option - basically just deploying a tire sized thick rubber balloon the instant before a collision, from both vehicles.

Or if the car is light enough, maybe it could jump.

Or like that table saw that stops when it hits flesh , you could have a break bar shoot down out of the bottom of the vehicle to jam into the road. Youd damage the asphalt but better some chunk of asphalt than a persons life.