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It is impossible to know exactly how many semi trucks are on the road in the U.S. It is estimated that there could be anywhere from five million to thirteen million semi trucks on the road in the U.S. on any given day.
850,000
There are over 3.5 million semi truck drivers in the U.S. Some of these own their own trucks and others work for corporation or trucking firms.
19 Billon trucks
daily on the road about 2.5 to 3.5 million maybe 10 times more mostly droped trailers on the factory lots
No real statistics on this are available, and even less so if your definition of "regular trucks" (which I'm assuming to mean box vans, dump trucks, and other straight trucks without trailers) includes vehicles under 26,001 GVWR, which do not include a CDL.
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not enough
Estimates of 15.5 million trucks operate in the U.S.
Better transportation and everyone could easily get around. now we have cars and Semi Trucks to do all of that.
a bunch There are 15.5 million trucks in the US and 2 million of them are tractor trailers according to Truck-Info
I seriously doubt any such statistics are published, but the most likely answer is that the majority of your sleeper berth trucks will have them, and they'll be fairly uncommon on day cab tractors.