That has nothing to do with going under/over a fence or disappearing... Throughout the entire video the driver goes randomly back and forth in a zig zag quickly and the dopey police officer for some reason doesn't react near as quick.
He clearly goes further to the left than the cop and could have easily gone around the fence and then just turned to go straight away from the cop car
He clearly goes further to the left than the cop and could have easily gone around the fence and then just turned to go straight away from the cop car