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>> “Why do you think the limit is 65?” <<
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Strictly for the revenue!
Highways are safer if traffic is moving at a more natural speed. 75 MPH is vastly safer than 65.
The engineering standards assume traffic is traveling at 85 MPH, but most states license people that can’t deal with 85, and that is where the problems arise, because they won’t go that fast, and others have to pass them constantly.
Where does the "natural safe speed" of the road come from? Engineering standards take into consideration the condition of the road, the usual amount of traffic, the frequency of exits and entrances, etc. I will never understand how 75 MPH is "vastly" safer than 65 MPH. We could easily drive 100 MPH or more on most highways, but the sh*t hits the fan when something goes a little wrong. How many people could handle a front blow-out at 75 MPH? Who could react in time when the pickup you've been following too closely has something fly out of the back of it at 75 MPH? Or what happens when someone entering the highway doesn't understand what the "acceleration lane" is for and pulls out in front of you at 30 MPH when you're doing 75 MPH? I could go on and on, but I think you get my drift. "Naturally" drive faster? No, most people drive faster than their ability to do so.