When I was in Los Fresnos, I got radio systems for our ambulances that could be programmed to operate on twenty frequencies. Since we were near the center of the county we provided backup services for Brownsville, Harlingen, Port Isabel, Rio Hondo, and South Padre Island, which together covered the whole county, so we had each of their frequencies, as well as the sheriff's, and neighboring police and fire department frequencies. Otherwise, there was too much time lost relaying information. Plus, most Valley EMS services were private so there was a lot of competition going on, along with the cooperation, so it helped to know what everyone else was doing. Rather than wait to be dispatched to an emergency, I'd often send an ambulance that way (code one) as soon as I heard the police department traffic; then when we were dispatched, our response times were great.