What Ermak fails to do here is to actually take into account where the suspect is sighted. For example if a suspect was last seen in the City, it is very likely he is still in the proximity at the time that you are talking to the victim (if applicable), therefor a better tactic would be to have some officers stand by in exits from that area, for example if in the city, just get a squad car positioned at the Regals parking and at the Hospital, this way then can radio in where the suspect is headed, and then you can handle accordingly.
This way you do not setup a shit ton of roadblocks, and you actually have a chance of apprehending him.