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Congestion & Reliability CSF
Congestion & Reliability CSF

Congestion & Reliability CSFs

Percent of Ohio’s primary and secondary roads that return to within 10 mph of expected speeds after the end of a snow event. Percent based on 2 hours for primary routes and 4 hour for secondary routes.

Travel Time Reliability Index (TTRI)


The Travel Time Reliability Index (TTRI) metric measures the percentage of time between the hours of 5 a.m. and 9 p.m. that Ohio travelers experience a free flow of traffic on Ohio’s freeway system. Free flow of traffic is defined as being able to operate a vehicle at or near the posted speed limit.


The statewide TTRI information is reported monthly to track the agency’s progress toward its quarterly goal and published quarterly in the CSF Dashboard during the State Fiscal Year (July 1st – June 30th).


PCR is collected once each State Fiscal Year (July 1st – June 30th) for ODOT’s entire state highway system. The data is reported monthly as counties are completed during the collection season (April to December) and published annually in the CSF Dashboard.


The data for the TTRI is collected on Ohio’s freeway system. This roadway system includes all Interstates (except the Ohio Turnpike) as well as select major “Interstate look-a-like” highways such as State Route 315 in Columbus, State Route 8 in Akron and U.S. Route 35 in Dayton. There are approximately 7,000 center-lane miles of roadway covered by this system.


The Office of Traffic in Central Office is responsible for calculating and reporting the TTRI.