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 or residential district, the speed limit is 25mph. In business districts, the speed limit is 20mph. In suburban districts, the speed limit is 45mph. Specific sections of rural interstate highway have a speed limit of 70mph, but most other areas, including urban interstate highways and those not otherwise posted, have a speed limit of 55mph, although the speed limit on unsurfaced secondary roads drops to 50mph at night.

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.