WisDOT MAPSS - Mobility - Reliability - Delivering transportation choices that result in efficient trips and no unexpected delays.
Reliability - Delivering transportation choices that result in efficient trips and no unexpected delays.This measure tracks the consistency of traffic patterns throughout the state. The Planning Time Index shows the disparity in travel times when drivers experience much longer travel times than expected. A decreasing planning time index means delay has been reduced from what it has been on those travel days with delay. The numbers are not comparable to MAPSS results published prior to 2018, as the federal performance data source, used for this measure, was revised in 2017. The travel time reliability goal is to improve reliability from the prior year’s performance result (a lower number is better).
To view more detailed information visit: Performance Map and Statewide County List.
Travelers expect to arrive safely and on time at their destination. Planning Time Index (PTI) expresses the predictability of on-time arrival in a mathematical term that helps travelers more precisely budget travel time and transportation planners better measure system performance.
Travel reliability measures variability of congestion. A wide variation in the recorded travel time indicates low reliability and a high planning time index. Traffic incidents, weather conditions, special events, holiday travel, sporadic demands and work zones are all dynamic components of traffic congestion that may adversely affect travel time reliability. Reducing or mitigating the impact of these factors makes travel time more reliable.
WisDOT is committed to enhancing reliability through its improvement program. The department completed several complex projects in 2025, including I-894 in Milwaukee County and portions of I-43 in Milwaukee and Ozaukee counties. The Northeast Region continues to make improvements to I-41 by reconstructing and expanding I-41 between Appleton and De Pere. Planning continues on numerous future roadway projects which will address deteriorating roadway conditions as well as safety, such as I-39/90/94 corridor in the Southwest Region. The Wisconsin Transportation Projects Commission (TPC) approved two new corridors for study in fall 2025, US 53 in the Northwest Region and I-94 Waukesha County in the Southeast Region. Wisconsin has recently made improvements to the online 511 system by integrating connected work zone devices, sharing verified work zone limits and lane closure start and end times. WisDOT strives to increase safety and operations through roadway improvements and innovation.