Intersection Safety and Operational Assessment Process

On September 10, 2024, Caltrans adopted the Intersection Safety and Operational Assessment Process (ISOAP) to replace the Intersection Control Evaluation for the purpose of evaluating proposed traffic control and design geometrics for intersections and other access improvements proposed on the State Highway System (SHS).  While this is not a requirement for our local public agencies and Tribes implementing projects off the SHS, the ISOAP methodology is strongly encouraged to be used as a performance-based analysis conforming to the Safe System Approach, which will reduce potential crash conflicts through comparative alternatives.

The below table has resources, tools, and trainings to help you develop an ISOAP program for the enhancement of safer intersections. 

Resource, Tool, or Training	Description	Date
ISOAP Guide	Guidance to implement ISOAP.	September 2024
ISOAP Fillable Excel Forms	ADA remediated excel forms containing Stage 1 Control Strategy Worksheet, Stage 1 Appendix, and Stage 2 Appendix.	August 24, 2024
ISOAP Stage 1 Long Form Example	A sample screening and initial assessment performed using a Stage 1 long form.	July 2, 2025
Using the ISOAP Process to Build Stronger safety Projects and Secure Funding	A training hosted by the Safety Navigator for California Communities to demonstrate leveraging ISOAP to enhance safety and broaden funding opportunities.	August 18, 2026
ISOAP Workshop Day 1	Day 1 discussing utilization of the ISOAP Workshop.	June 16, 2025
ISOAP Workshop Day 2	Day 2 discussing utilization of the ISOAP Workshop.	June 17, 2025
ISOAP Rollout Training	A safe system approach to find the best solution to intersection safety.	December 17, 2024
Contacts and Additional Resources	District contacts and additional resources from the Caltrans Traffic Operations website.

 

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