We don’t have to pick just one criteria, I’d also have a “large vehicle” stamp to cover anything longer than a stationwagon or taller than ~6 feet. The relevant highway acceleration is more the 40-75mph range, but there’s definitely a relationship between quickness and safety. Crucially, I think that relationship only exists for competent and practiced drivers. Faster acceleration in the hands of a teenager is not safer on the highway. And “driver’s responsibility” is clearly not working.
We don’t have to pick just one criteria, I’d also have a “large vehicle” stamp to cover anything longer than a stationwagon or taller than ~6 feet. The relevant highway acceleration is more the 40-75mph range, but there’s definitely a relationship between quickness and safety. Crucially, I think that relationship only exists for competent and practiced drivers. Faster acceleration in the hands of a teenager is not safer on the highway. And “driver’s responsibility” is clearly not working.