Things that are smooth at normal scale become very rough and bumpy when scaled up. Check out this close-up of asphalt.

or this close up of cement

Both would be smooth roads for a vehicle at normal size. But if you shrink the vehicle to Hot Wheel size, those roads suddenly become VERY rough and treacherous. While Scott and Hope are driving at shrunken size, they have a very smooth ride. Hank Pym must have done some vehicle modification in addition to shrinking them.
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Asphalt image is borrowed from Shutterstock. Cement image is borrowed from Alamy. Image usage qualifies as fair use under US copyright law.