I think it'd be more balanced and good for the game to add some delays, if not already in, and dependent maybe upon skillcheck vs skillcheck when it comes to moving from one blockade direction to the next blockade direction. As it is, it appears one vehicle can endlessly move from between blockaded position to another, essentially keeping a targeted vehicle in place with no chance for escape I think.
This is especially true if the vehicle that's trying to escape is turning around, as it appears (at least from personal experience) that the blockading vehicle can just go and blockade the 'turn around direction' without any delay, giving them an unnatural advantage over the vehicle attempting to escape.