The 85th percentile rule in speed limit setting—an arbitrary but longstanding convention—has begun to weaken in recent years, with new guidance now allowing for lower speeds. FHWA’s USLIMITS2, for example, allows for speeds down to the 50th percentile in certain cases.
Now there’s a growing push to take observed vehicle speed out of the speed limit equation entirely.
Such is the approach that NACTO will recommend in a forthcoming practitioners’ guide. NACTO’s Jenny O’Connell previewed the guide at this month’s TRB annual meeting.
Have more mobility news that we should be reading and sharing? Let us know! Reach out to Sage Kashner (kashner@ctaa.org).
Please confirm you want to block this member.
You will no longer be able to:
Please note: This action will also remove this member from your connections and send a report to the site admin. Please allow a few minutes for this process to complete.