Roadway Standards Abbreviations

The following abbreviations apply to Clackamas County Roadway Standards.

• AASHTO: American Association of State Highway and Transportation Officials
• ADA: Americans with Disabilities Act
• ADT: Average daily traffic
• APWA: American Public Works Association
• ASTM: American Society for Testing and Materials
• BCC: Clackamas County Board of County Commissioners
• CRC: Clackamas Regional Center
• DTD: Clackamas County Department of Transportation and Development
• EOR: Engineer of Record
• FHWA: Federal Highway Administration
• ISD: Intersection sight distance
• ITE: Institute of Transportation Engineers
• MPH: Miles per hour
• MUTCD: Manual on Uniform Traffic Control Devices
• ODOT: Oregon Department of Transportation
• PI: Point of intersection
• PC: Point of curvature
• PT: Point of tangency
• SSD: Stopping sight distance
• UGB: Urban Growth Boundary