Intersection Safety and Operational Assessment Process
Intersection Safety and Operational Assessment Process (ISOAP) updates the process the Department uses to evaluate proposed traffic control and design geometrics for intersections and other access improvements proposed on the State Highway System. ISOAP refers to a data-driven, performance-based framework incorporating the Safe System Approach to screen intersection strategies and identify optimal solutions for new or improved intersections that considers all users.
| Training Resources | |
| 12/17/2024 ISOAP Rollout Training (PDF) | 12/17/2024 ISOAP Webinar Questions (PDF) |
| 12/17/2024 ISOAP Webinar Training (PDF) | 11/20/2024 ISOAP Webinar Questions (PDF) |
Traffic and Performance Analysis Methodologies and Tools
- Roundabout Capacity and Operational Analysis
- Publication No. FHWA-SA-15-070, Assessment of Roundabout Capacity Models for the Highway Capacity Manual, September 2015
- Safety Performance / Collision Cost Analysis Tool
- For general information, contact a District ISOAP Coordinator or a Technical Assistance Program (TAP) Coordinator.
- To arrange for basic instruction, training, or technical assistance, contact the District Safety Engineer or the appropriate specialists identified under the section on ISOAP TAP Team.
District ISOAP Coordinators
| District | Coordinator | Backup |
| 1 | Paul Hailey | Eric Brunton |
| 2 | Frank Rivas | Jesse Solorio |
| 3 | Scott Waksdal | Taran Dhugga |
| 4 | Whitney Lawrence | N/A |
| 5 | Bing Yu | Sam Toh |
| 6 | Caleb Wu | Alex Correa |
| 7 | Wilfred Domingo | N/A |
| 8 | Siva Sivakkolunthar | Rithy Sar |
| 9 | Lianne Talbot | N/A |
| 10 | Jaime Quesada | N/A |
| 11 | Safwat Ibrahim | Jason Janis |
| 12 | Jose Hernandez | N/A |
| HQ | Zifeng "Lilian" Wu | Zeyu "Chester" Gao |
Please contact your ISOAP coordinator per your district for assistance.
ISOAP Technical Assistance Program
The primary role and service of the ISOAP TAP is to provide technical assistance and training to support ISOAP implementation by Districts, local and regional transportation agencies, and other project sponsors. Technical support is provided through consultation on matters related to the following:
- Complex and controversial access proposals, strategies and concepts.
- The assessment, scoping, analysis and design of innovative access strategies – especially those for which formal technical guidance has not yet been established.
Technical Assistance Program Coordinator
- Lilian Wu - HQ Division of Traffic Operations
ISOAP TAP Team
- Caltrans personnel
- John Liu - District 6 Maintenance and Operations
- District ISOAP Coordinators
- District practitioners with specialized skills, knowledge and experience
- Qingmeng Li - Safety Programs
- FHWA Resource Center Specialists