Additional Performance Measures
OKI continues to incorporate several additional congestion management performance measures within the CMP to further assess congestion and identify areas for transportation improvement. These additional performance measures are:
Travel Time Index
(TTI)
Intersection Delay and Level-of-Service
(LOS)
Peak Period Travel Times between Major Destinations
Incident Clearance Time
Transit Ridership
Travel Time Index (TTI)
The relative severity of travel congestion is measured by the ratio of the peak travel time to the travel time at free-flow speeds. A travel time index of 1.2 means travel speeds are 20 percent slower than free flow for a given time period. Travel time index measures how much congestion is present for a given road segment. The map shows several contiguous bottlenecks occurring during the morning (6-9 a.m.) and evening (4-7 p.m.) weekday peak periods in 2018.
Travel Time Index 2018
Congestion can also occur outside of peak hours and can vary in intensity within the hour. The duration relates to the amount of time congested conditions persist before returning to an uncongested state. The chart presents the four roadway segments in the OKI region to experience 10 hours of congestion or more per day.
Intersection Delay and Level-of-Service
Intersection delay is the average time needed for a vehicle to pass through the intersection. The average time is reported in seconds and is the cumulative delay of all vehicles. Each intersection is assigned a level-of-service based on the delay.
In the summer of 2019, data was collected from 7-9 AM (AM Peak) and from 4-6 PM (PM Peak) at regionally significant intersections to assess both intersection delay and level of service.
How is the OKI region doing?
OKI is working on an interactive map for intersection delay and level-of-service. We anticipate the map being completed by late 2021.
Peak Period Travel Times between Major Destinations
To examine travel times within the OKI region, major destinations, including the Greater Cincinnati/Northern Kentucky International Airport (CVG), downtown Cincinnati, Eastgate shopping area, Northern Kentucky University, Kings Island and Sharonville, were chosen for analysis.
PM peak travel times were used because PM is typically more congested. The travel times are average weekday PM peak hour travel times for 2018. Times are for a route on the shortest interstate highway path between destinations. These times only include travel to the section ending nearest the destination; therefore, a small amount of additional travel time, not reflected here, may be necessary to reach the destination.
Time in parenthesis = 2015 travel times
Time outside of parenthesis = 2018 travel times
Incident Clearance Time
Incident management consists of a planned and coordinated multi-disciplinary process to detect, respond to, and clear traffic incidents so that traffic flow may be restored as safely and quickly as possible. Effective incident management dramatically reduces the duration and impacts of traffic incidents. The ODOT Traffic Operations Control Center in Columbus monitors traffic with over 80 cameras in the OKI region and facilitates communication among law enforcement and emergency responders. The chart shows the trend in average clearance time by quarter. Clearance time refers to the duration between when the incident record was opened and closed.
Transit Ridership
Nearly all of the transit trips occur on the Congestion Management Network; therefore highway congestion directly impacts transit travel. Increasing transit ridership helps reduce demand on the highway system. The OKI travel demand model estimates that public transportation eliminates less than 10,000 daily person trips by automobile. The chart shows trends in annual ridership by transit agency.