In this section you will find informational resources including online maps, reports, manuals, and links to County Standard Plans and other government resources. Reference Materials (in PDF format)
- Master Plan of Arterial Highways (MPAH)
Find links to the Orange County Transportation Authority’s Road Master Plan, covering freeways, arterial highways and local streets. - OCTA Annual Traffic Volume Map
Find detailed map of County streets, toll roads and State freeways showing daily traffic volumes. - Orange County Traffic Manual
Find a compellation of specific guidelines staff utilize when conducting traffic safety investigations - Unincorporated County Bridge Index
Find list of County bridges by name and location. - Addendum No. 1 to RDMD Standard Plans, 2006 Edition
Addendum No. 1 to RDMD Standard Plans, 2006 Edition. - Five Percent Reports
Highway Safety Improvement Program “5 Percent Report” Requirement. - Sideweir, Dr. Mostafa, OC Study Text
