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OCPW Traffic Study


Traffic Design & Signal Operations (TDS&O)

TD&SO staff oversee the operation and maintenance of over 120 traffic signals and other traffic control devices within unincorporated Orange County and for the John Wayne Airport and OC Waste and Recycling agencies, this includes the management of the Traffic Signal Maintenance contract* and the Traffic Management Center (TMC)*.

TD&SO is also responsible for:

  • Design of traffic signal plans
  • Perform Traffic Index calculations
  • Provides traffic engineering support for:
    • Review and design of signing and pavement delineation plans and temporary traffic control plans
    • Project reviews of traffic signals for Developments
    • Construction support for requests by contractors/inspectors/road maintenance staff
    • Respond to requests from residents regarding signal operations


Traffic Investigations & Studies (TI&S)

TI&S is responsible for performing traffic safety and operational investigations to ensure that roadways within unincorporated Orange County are safe and efficient to travel under normal operating conditions. Through investigations and analysis, staff identify safety issues and/or deficiencies, and recommend mitigation measures, some of which may be further developed into County’s Capital Improvement Projects and others may be implemented by OC Public Works via work orders.  Major responsibilities of TI&S include but are not limited to:

  • Determine the need for traffic calming measures, parking restrictions, crossing guard placement, and roadway safety improvements
  • Determine the use of traffic control devices such as street signs, pavement markings, and traffic signals
  • Establish speed limits based on Engineering and Traffic Studies
  • Establish street names
  • Establish traffic-related County Ordinances and Resolutions by obtaining Board of Supervisors’ approval
  • Collect and maintain traffic related database such as volume counts, speed surveys, and collision reports
  • Respond to all traffic-related inquiries whether from the citizens, peer agencies, the elected officials, or engineering consultants
  • Collaborate with law enforcement agencies to ensure public conformity of the traffic law and County ordinances
  • Collaborate with other departments or agencies in developing Traffic Impact Studies for infrastructure projects  

Orange County Traffic Committee (OCTC)

TI&S staff serve as staff support to the OCTC by preparing meeting agenda, staff reports, public presentations, and documentation of comments. The OCTC conducts meetings monthly as needed on the third Thursday of the month at 9 a.m. All meetings of the OC Traffic Committee are open to the public and can be attended in person at:

County Administration South
Multipurpose Room 103
601 N. Ross Street
Santa Ana, CA 92701

Visit our OC Civic Center parking page for map and details.

* Traffic Signal Maintenance contract:
This contract’s services  provides required preventative and extraordinary maintenance to traffic signal systems owned and operated by the County of Orange.

* Traffic Management Center (TMC):
The TMC is a central system for proactive monitoring and operation of traffic signal systems owned and operated by the County of Orange.