Volume of traffic on the Primary Road System
Starting in the 2010 report, traffic-volume segments include the mainline, ramps, loops, and connections
at interchanges while inner legs or at-grade level intersections are not shown in the annual report.
Prior to 2010, ramps (all types of arrangements and sizes of turning roadways connecting two or
more "legs") at interchanges or at-grade intersections are not shown in these reports.
Traffic volumes for these road segments may be obtained from the Office of Systems Planning by calling
515-239-1323 or emailing Ronald Bunting at