Kentucky National Highway System (NHS) Congestion and Reliability Map

Weekday

Information was obtained from Regional Integrated Transportation Information System (RITIS). Travel times are based on 2019 weekday hourly travel times from the National Performance Management Research Data Set (NPMRDS) obtained by the Federal Highway Administration (FHWA).

Measures Reported:

Planning Time Index - The total travel time that should be planned when an adequate buffer time is included (95% Travel Time / Free-flow Travel Time). This index is generally associated with travel reliability. The planning time index compares near-worst case travel time to a travel time in light or free-flow traffic. For example, a planning time index of 1.60 means that, for a 15-minute trip in light traffic, the total time that should be planned for the trip is 24 minutes (15 minutes x 1.60 = 24 minutes).
Travel Time Index - Travel time represented as a percentage of the ideal travel time (Average Travel Time / Free-flow Travel Time). This index is generally associated with recurring traffic congestion.

Hourly measures have been extracted from NPMRDS representing an average of all weekdays in 2019. Through a dropdown box in the upper right corner, maps are provided for:

MAX PTI, MAX TTI = maximum hourly value over all hours of day
AM PTI, AM TTI = Average of hours in AM peak period (6am - 9am)
Midday PTI, Midday TTI = Average of hours in Midday time period (9am - 4pm)
PM PTI, PM TTI = Average of hours in PM time period (4-7pm)

Note: by zooming in one can see the values by direction of road.

Colors have been assigned to the values as follows:

TTI

No Congestion (<1.3)=Green
Low Congestion (1.3-1.5) = Yellow
Medium Congestion (1.5-2.0) = Orange
High Congestion (2.0-4.0) = Red
Severe Congestion (>4.0) = Dark Red

PTI

No Congestion (<1.5)=Green
Low Congestion (1.5-2.0) = Yellow
Medium Congestion (2.0-2.5) = Orange
High Congestion (2.5-5.0) = Red
Severe Congestion (>5.0) = Dark Red

Source Data: