It is the same when I was driving a 1992 Sentra (B13) on the expressway. The car would be "pushed" and "pulled" by the wake of big trucks and buses on the expressway. Drivers in smaller cars would experience this effect more probably because of soft suspension and the relatively tall sides (in ratio to the car's width).
But I don't think it is anything to be concerned much about given the speed limit we have on the expressways. So unless the truck/bus would be traveling in massive excess of 180kph, a small car wouldn't be flung off the road by a passing truck's wake.



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