Left turns are a big problem on the south side of State Center.
Last week, residents and the Iowa DOT had a meeting about the increase in accidents over the past 18 months. This is the second such meeting in that time frame; see this blog post from August. The main issue is eastbound traffic turning north, which involves crossing the westbound lanes.
In the more recent meeting, the Marshalltown Times-Republican reports, DOT engineer Willy Sorensen said lowering the speed limit in the area would only be a “feel good” solution.
The intersection has a narrow median. This is likely due to the fact that about a mile of US 30 was originally built as four lanes here in the early 1960s. Then the highway west to Colo and east to IA 330 was upgraded to four lanes in 2010-11.