You have a good point about semi's not being able to stop as fast as cars, but NHTSA is trying to change that. I think they're trying to cut the stopping distance in half, from 600 feet to 300 feet at 65 MPH.
It's very doable, a fully loaded semi has the traction to stop faster, but not enough braking power. The current favorite is switching the drums that 99.9% of semis have for disk brakes.
All i'm saying is don't assume that the trucks will always take as long to slow down as they do now.
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