Exit 232B from Interstate 35 is a diamond interchange with traffic lights north of the Johnson County line, just inside Kansas City.

The freeway then crosses the Kansas River and the east end of the BNSF rail yard on the 18th Street Expressway Bridge.

North of the K-32 interchange, 18th Street passes over another rail yard, this one belonging to Union Pacific.

This interchange, Exits 420A–B from I-70, also serves as the official eastern terminus of the Kansas Turnpike, though the actual tolled section ends 10 miles (16 km) further west.

[2] Upon completion of the bridge, US 69 was rerouted onto the expressway from Southwest Boulevard (the section of which has since been renamed to Merriam Drive).