Patent ID: 8760315

Claim:
A system for controlling traffic for allowing passage of an emergency vehicle through an intersection controlled by traffic signals, the system comprising: a first circuit card configured for insertion into a first card slot of a traffic detector card rack having a plurality of card slots, the first circuit card including an intersection module for transmitting signals for preempting the traffic signals, the first circuit card including a plurality of contact closure outputs and an interface for transmitting a plurality of messages, the traffic detector card rack being a component inside a traffic control cabinet, wherein the intersection module receives power from the detector card rack; and one or more second circuit cards coupled to the first circuit card, each of the one or more second circuit cards including a plurality of contact closures for outputting one or more signals for preempting the traffic signals, each of the second circuit cards configured for insertion into one of the plurality of second card slots in the traffic detector card rack; wherein, the intersection module is configured to select a circuit card from the one or more second circuit cards based on a type of output desired, and further select one or more contact closures of the selected card for the desired output, and wherein the interface in the first circuit card is configured to transmit a corresponding message to the selected one or more contact closures of the selected circuit card for output.