The Optical Signal Processor (OSP) receives the electrical signals from the optical preemption Detectors. While being received, the signals are processed to determine if the vehicle is a valid emergency or transit vehicle and the vehicle's code, if so equipped.

The OSP is connected directly to the preemption inputs of the traffic controller in the intersection in which it is installed. When a vehicle's signal is accepted as valid, the OSP sends a preemption request to the proper input of the traffic controller.

The traffic controller then safely manipulates the traffic signals according to a preprogrammed algorithm. Depending on where the traffic controller was in its normal routine the vehicle will receive a "Green Light" after a minimum of 3 or more seconds. Traffic signals which are already green will stay green until the vehicle passes.

If multiple vehicles are being received, they are prioritized to determine which vehicle should be given the right of way. If vehicles are of equal priority, right of way is given on a first-come, first-served basis.

The 2070 Optical Signal Processor (OSP) is TOMAR’s entry level OSP providing the advanced detection and discrimination capabilities of all 2000 Series OSP’s without the communication and configuration options needed in large traffic systems.

The 2080 Optical Signal Processor (OSP) is TOMAR’s mid-range OSP providing the advanced detection and discrimination of all 2000 Series OSP’s with improved system security and upgradeability.

The model 2140 optical Signal Processor (OSP) is the most advanced of the three 2000 Series OSP’s offered by TOMAR. Installed inside the traffic cabinet, the 2140 provides power for 209X Optical Detectors, receives and decodes signals from the detectors, logs preemption and priority control activity, communicates with other traffic control devices, and optically isolates the preemption channels