- Safety Analytical Methods Subcommittee, ACS20(1)
- User Liaison Subcommittee, ACS20(2)
- Surrogate Safety Measures Subcommittee, ACS20(3) – website (website will be phased out)
- Pedestrian and Bicycle Safety Analysis Subcommittee, ACS20(4) – website (website will be phased out)
The committee also has a joint subcommittee with ACS10 and AKD30: Rural Road Safety Policy, Programming, and Implementation Subcommittee, ACS10(4).
Learn more about how subcommittees work from this TRB document (PDF).