HWY 141 Past Johnston exit heading towards Urbandale
Heading south, once you pass the Johnston exit you come upon a series of hills. The Highway Patrol has an airplane that clocks you coming down one, and as you go over the next, the officers are stationed on the median flagging down those who were over the limit. (You don’t see them at all until you crest the hill, and by then, they are already flagging you down)
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