codes to determine a response: priority 0 represents an emergency call when there's an immediate threat to life, such as an incident requiring resuscitation. priority 1 represents an emergency call. (response time target is to attend to 90% of emergency calls within 15 minutes) priority 2 represents an urgent call. use of lights authorised and siren allowed only when passing through heavy traffic and clearing intersections. (response time target is to attend to 90% of urgent calls within 25 minutes) priority 3 represents a non-urgent call. (response time target is to attend to 90% of non-urgent calls within 60 minutes) .. the western australian police uses the following codes from 1 to 7 to determine response actions: priority 1 is an emergency call. lights and siren authorised. an example of a priority 1 call would be an armed holdup call, or an officer down. priority 2 is a less urgent emergency call. lights and siren authorised, but follow basic traffic rules. an example of a priority 2 call is a serious shots fired or officer in trouble/officer requires urgent assistance priority 3 is an urgent call, lights and siren authorised, but follow basic traffic and road rules. priority 4 is a less urgent call. lights and siren authorised but follow more advanced traffic rules and the speed limit. priority 5, 6, and 7 is a standard call. no lights or siren authorised and follow all traffic rules. the department of fire and emergency services have two response codes: fire call is the response that authorises lights and sirens, and disobeying road laws within reason. this is the response for most calls, including bushfires and road crashes. normal road is the second response that requires the appliance to follow road regulations and not use emergency lights and siren. this code is rarely used for initial responders, but is given to further appliances if the incident doesn't require immediate assistance. this is also the only code that the state emergency services are authorised to respond with.