A highway construction project in Kansas City has addressed a problem that snarled traffic there the past 43 days.

State transportation officials speculate that groundwater build-up undermined a retaining wall at Three Trails Crossing, causing a 34-foot-wide gap in I-470, shutting down the crossing for more than a month. Drivers who took westbound I-470 and northbound US 71 had to funnel into I-435.

A 225-foot-long, $5.2 million bridge has been erected and traffic flow has been restored.