Motorists want to travel through work zones with as little inconvenience as possible. MoDOT tries to minimize travel impacts by shifting work to times when there are fewer impacts to the traveling public. Other strategies include using technology in work zones, providing valuable information to customers and innovative uses of traffic control devices to promote efficient traffic flow. To measure the effectiveness of these strategies, MoDOT monitors the performance of work zones with the greatest potential to impact traffic each quarter. The goal is to minimize the number of times a work zone creates a traffic delay of 10 minutes or more.
MoDOT has monitored 620 work zones in 2022. There have been 858 work zone delays of at least 10 minutes. The total congestion is 444 hours. MoDOT has seen traffic increase after the COVID reduction in 2020. This has led to increased congestion from work zones. From second quarter to third, delays decreased from 405 to 348. Hours of congestion decreased from 192 to 159. Though this is a decrease, overall this is a 41% increase as compared to the same quarter in 2019.
This quarter, the bridge and pavement work on I-44 in Central District and I-55 bridge work in St. Louis district caused 38 hours of congestion. The design-build project on I-270 caused 59 hours of congestion due to bridge reconstruction. These projects have contributed a total of 97 hours of the 159 hours (61%) of congestion this quarter. For the year, bridge improvement projects continue to be the largest contributor of delays at 85%.
The target for the cumulative work zone congestion statewide is 180 hours per year. This target translates to approximately 30 minutes of congestion per day statewide.
Purpose of the Measure:
Work zones are designed to allow the public to travel through them safely and with minimal disruptions. This measure tracks the performance of significant work zones.
Measurement and Data Collection:
Work zone impacts are identified using automated data collection and visual observations. An impact is defined as the additional time a work zone adds to normal travel. Impacts resulting in a delay of at least 10 minutes are included in this report. The targeted hours of work zone congestion are based on previous years' data and an acceptable tolerance of 30 total minutes for work zone congestion statewide. The target for this measure is updated quarterly.
State Highway Safety and Traffic Engineer
Highway Safety and Traffic
Phone: (573) 526-2803
Phone: (573) 526-2803