Assuming the roads are safe and clear, how fast can you legally go? Well, it depends on where you are. In a posted school zone, the speed limit is 20mph while children are present. The same goes for railroad crossings or intersections when your view is obstructed. In business or residence districts, the speed limit is 25mph. Specific sections of highway have a speed limit of 75mph, but other areas might be posted as 65 or 70, and gravel roads and highways not otherwise posted have a speed limit of 55mph.

Other than that, you are likely to see speed limit signs indicating a wide range of limits based on a variety of conditions, such as constructions zones, school zones, or half-finished-then-abandoned bridge zones. Just remember to always drive no faster than the speed limit (and slower still if conditions are poor) so that you don’t go ramming into the rear end of a hatchback or flying off into a river.