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Iowa State University--Becoming the Best

Road Safety Audit for US 151 from Amana to US 30 in Cedar Rapids

North ramp terminals at US 151/US 30 interchange


Principal investigator:

Project status


Start date: 05/12/10
End date: 10/31/10


Report: Road Safety Audit for US 151 from Amana to US 30 in Cedar Rapids (11.74 mb pdf) May 2011


Sponsor(s): Iowa Department of Transportation

About the research


US 151 was originally constructed as IA 149 in 1931-1934 and has been rehabilitated several times. The most recent major improvements, which were completed in 2005-2006, consisted of hot mix asphalt resurfacing and partial shoulder paving. Major widening and resurfacing improvements were also completed in 2007 between Fairfax and US 30 in Cedar Rapids.

According to a preliminary 2009 estimate, traffic volumes range from about 5,900 vehicles per day (vpd) north of Amana to about 14,400 vpd at the US 30 interchange in Cedar Rapids. In response to high crash densities and medium to medium-high crash rates along the route, the Iowa Department of Transportation (Iowa DOT) requested a road safety audit to examine the roadway and suggest possible mitigation. Representatives from the Iowa DOT, Federal Highway Administration, Institute for Transportation, local law enforcement, and state government met to review crash data and discuss potential safety improvements to this segment of US 151.

This report outlines the findings and recommendations of the road safety audit team for addressing the safety concerns on this roadway.