Chapter 4 of 518% of exam
Speed & Conditions
Posted limits assume ideal conditions. Missouri's Basic Speed Law also requires you to slow down when traffic, weather, or the road makes the posted limit unsafe.
Speed limits
Missouri posts a maximum of 70 mph on rural interstate highways, with lower limits on other roads and in cities. Always obey the posted signs, which may be lower than the maximum.
Basic Speed Law
Never drive faster than is reasonable and safe for current conditions, even when that speed is below the posted limit. Adjust for traffic, weather, curves, and visibility.
Fog, rain, and ice
Use low beams in fog, since high beams reflect back and reduce visibility. On wet or icy roads, slow down, increase your following distance, and avoid using cruise control.