A 3-minute lesson from the Missouri course. Read the rules and examples, follow the handbook page references, and check your understanding before you move on.
A speed limit is the most you may drive in ideal conditions, not a promise that the speed is safe. Missouri sets limits by road type and requires you to slow down when conditions demand it. Railroad crossings have their own must-stop rules.
Know the rule
Adjust your speed for hills, curves, slippery roads, limited sight distance, pedestrians, bicyclists and slow-moving vehicles. By law, you must slow down when conditions demand it.
Interstates also have minimum speeds. You may not drive slower than 40 mph on interstate highways under normal conditions; if that's too fast for you, use another route.
The Missouri Highway and Transportation Commission may set limits higher or lower than the uniform maximums for safety or traffic flow. Lower speeds are often posted on urban interstates with frequent interchanges.
The white X-shaped sign at a railroad crossing. It means the same as a yield sign: yield to trains. A sign below it shows how many tracks cross the road.
Red lights start flashing as you near a crossing. Stop between 15 and 50 feet from the tracks. After the train passes, the lights keep flashing and there's a second track, so look for another train before you go.
Check your understanding
Read the question, decide on an answer, then open it to check the explanation. These are Roadwise study questions based on the source handbook.
What is the minimum speed you may generally drive on a Missouri interstate highway under normal conditions?
40 mph
25 mph
50 mph
55 mph
Answer: 40 mph
You may not drive slower than 40 mph on interstate highways under normal roadway conditions.
