Iowa Department of Public Safety Iowa State Patrol Division
 
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ARE YOU SPEEDING?

Is your speedometer accurate?

Here’s a handy way to check your speedometer. Keep a steady speed and clock yourself between the mile posts on most of our highways.

MPH---SEC.   MPH---SEC.
45---80   57---63
46---78   58---62
47---76   59---61
48---74   60---60
49---73   61---59
50---72   62---58
51---70   63---57
52---69   64---56
53---68   65---55
54---66   66---54
55---65   67---53
56---64   68---52

CAUTION

Do not look at your watch while driving.

Do not attempt to check in heavy traffic.

Do not check when road conditions are less than normal.

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