Oregon Department of Transportation, Highway Division Rule Rule 734-020-0300 Standards for Installation, Operation and Use of Traffic Control Signal Operating Devices The Department of Transportation is responsible for establishing standards for signal preemption devices and the use of traffic control signal operating devices for use upon the highways within the state. The Department is also responsible for establishing priorities among authorized operators of traffic control signal operating devices. Authorized operators include operators of emergency vehicles, buses and traffic signal maintenance vehicles. These standards consider safety, the efficiency and response times of emergency response operations, requirements for traffic signal maintenance, the efficiency of public transit operations and traffic flow. OAR 734-020-0300 (Standards for Installation, Operation and Use of Traffic Control Signal Operating Devices) through 734-020-0330 (Standards for Use of Traffic Control Signal Operating Devices) do not apply to rail vehicles.