Data is summarized from the National Performance Measures Research Dataset (NPMRDS) for all weekdays in 2021. Data provided courtesy of FHWA and summarized by OKI.

More information on how congestion and reliability metrics are calculated is available here and here.

Questions or comments? Email Brandon Flessner

Percent Slower Than Free Flow Speed (Weekdays | 2021)
Morning Rush Hour (6 - 9 AM)
Evening Rush Hour (4 - 7 PM)
Midday (9 AM - 4 PM)
Overnight (7 PM - 6 AM)
Weekday (All Day)
Level of Travel Time Reliability (2021)
All Vehicles
Trucks (Interstates only)
Person Hours of Excessive Delay (Weekday Peak Periods 2021)
Click a segment on the map to learn more.
Zoom in for more detail.