Are the patrol paths unique? By that I mean, do the sheriff units when sent on patrol stay out in the county, city units stay in the city, and state patrol units stay on the highway? I haven't been sending units on patrol mostly because A. I can't keep track of which units are where and B, I don't want my county units to be way down in the city when I need them.
Also, I think it would be helpful to put unit numbers on the roofs, at least for PD/SO. Real life departments in the US do this often to assist with identifying them from a helicopter, but it would also help us learn/remember which units are where when we need to call the closest one. It throws me off when I try calling a unit because the suspect is right by the sheriff office and the responding unit is actually coming from the gas station or that one house driveway and the suspect escapes.