Return of the Ridge Raiders - S2-E20
Continuity mistake: The boys are driving along an open dirt road, being chased by the Sheriff. As they meet a blue car, they wave, and you notice that there are no bushes anywhere to be seen. When the blue car meets the cop cars, there are suddenly bushes on either side of the road, poorly disguising ramps used to flip the cop cars.
Answer: Various reasons, but mainly to drive the Dukes out of Hazzard County because the family have been foiling his schemes since his and Uncle Jesse's bootlegging days.
Captain Defenestrator