FDNY has a similar policy although occasionally details of an incident get lost (or are never given) between the PD call taker, EMS dispatcher and the MDT sometimes resulting in finding ourselves in unsafe scenes. That said such precautions are a luxury compared to my time in Newark were PD was stretched so thin that we'd sometimes go to violent scenes without their protection, wrestling combative patients, fighting knifes out of hands, etc. That said calling a Code 5 in Newark made a 10-13 in the city look like child's play. Quite literally every ambulance in the city some may or may not with patients still in them would come screaming along with PD, ESU, fire, basically everyone with a radio.