Both. Driving is much scarier in terms of kinetic energy, anyway.
A 20mm rifle is a perfect example of how velocity kills in gun terms. 60000J of energy in one trigger pull. This is equivalent to a car traveling at 15-20mph.
On badly designed streets and with bad and/or speeding drivers, on the other hand.
And don’t get me started on the dangers of cars with high hoods. We’ve known for years that to keep pedestrians and cyclists safe, they need to go on top of the car, instead of under it.
A Toyota Corolla going 65MPH is a lot of kinetic energy.