sometimes police monitoring you can get a heads up, sometimes the fire gives you a heads up. Actually if the fire beat is what the reporter wants, police traffic about speeders, family disputs, who shot who, would just take time to screen that out. Now traffic about an accident, and the police asking for rescue, you could get a heads up prior to the fire getting dispatched. As Captaincab says, a scanner would be the most current method as several computer feeds are delayed 15 min to 30 mins because police and fire have "secrets" and they want to take care of them prior to onlookers showing up. Police think the bad guys are monitoring so their traffic is delayed. Most modern scanners are too complex for wantabes. They have a hard time keeping their pants up, let alone a scanner programmed.