Cooperative Intersection Collision Avoidance Systems (CICAS)
Project Description
The Cooperative Intersection Collision Avoidance Systems (CICAS) initiative is one of nine intelligent transportation systems (ITS) initiatives supported by the U.S. Department of Transportation (USDOT). The CICAS initiative focuses on determining the optimal combination of infrastructure and in-vehicle systems needed to address a full range of intersection crash problems. CICAS integrates two types of intersection collision avoidance systems: infrastructure-based and vehicle-based. Infrastructure-vehicle cooperative systems, which comprise the bulk of the CICAS future research, unify infrastructure and in-vehicle systems to give drivers the best possible information to help avoid a collision.
The four areas of study under CICAS:
- CICAS-CBAT (Cost Benefit Analysis Tool)
- CICAS-V (Violations)
- CICAS-SLTA (Signalized Left-Turn Assist)
- CICAS-SSA (Stop Sign Assist)
MnDOT and the University of Minnesota focused on warning drivers of unsafe gaps at rural thru-stop intersections in the CICAS-SSA project. CICAS-SSA was a successor to the Intersection Decision Support project and its cooperative aspect and coordinated with the Vehicle Infrastructure Integration (VII) initiative.
Project Benefits
- Reduced fatalities and injuries at rural thru-stop intersections
- Delayed or eliminated need for a traffic signal
Project Documents
- Concept of Operations (PDF) (March 2008)
- CICAS-SSA Report #1 (PDF)
- Alert and Warning Timing for CICAS-SSA
- CICAS-SSA Report #2 (PDF)
- The Design of an Optimal Surveillance System
- CICAS-SSA Report #3 (PDF)
- Macroscopic Review of Driver Gap Acceptance and Rejection Behavior in the US
- CICAS-SSA Report #4 (PDF)
- Sign Comprehension, Rotation, Location, and Random Gap Simulation Studies
- CICAS-SSA Report #5 (PDF)
- On-Road Evaluation of the Stop Sign Assist Decision Support Sign - Final Report(PDF)
- Executive Summary (PDF)