What happens when two vehicles approach the same intersection at the same time from different directions?
First, it should be noted that this situation can occur with or without a preemption system, and drivers should always be aware of this possibility. Priority Command provides four levels of high-priority preemption plus two levels of low-priority preemption. The priority level is set with a DIP switch inside the vehicle transmitter case. It is recommended that priority levels be assigned as follows: Level one: Heavy fire vehicles such as pumpers, tankers, and ladder trucks Level two: Medium trucks such as ambulances and rescue vehicles Level three: Light trucks, SUVs, and cars such as police cruisers Level four: Lower-priority emergency vehicles such as chiefs’ cars and prisoner transports. Level five: Express busses, snow plows, and tow trucks responding to police calls. Level six: Local busses. When two vehicles of different priority levels approach the same intersection at the same time, the higher-priority level will receive the preemption. An ambulance will have priority over a po
