But (as has been said many times before) if you drive on California freeways (and presumably those in Texas & many other states), you're inevitably going to be following some vehicle too closely, because if you leave anything like an adequate separation, one or more cars will cut into it. That being the case, there are advantages to the lead vehicle being a semi, in addition to the windbreak effect. Most semi drivers are less disposed to sudden brake application, if they do brake they'll probably decelerate at a slower rate than a smaller vehicle, and if all else fails, most have those nice bars across the back to prevent you running underneath. And of course you don't have to worry about hurting a carload of people.
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