Chapter 4 of 516% of exam
Speed & Driving Conditions
Posted limits are maximums for ideal conditions; safe drivers slow down for weather and traffic.
Speed limits
A posted limit is the maximum allowed under ideal conditions, not a required speed. Slow down when visibility, traffic, or road surface make the posted speed unsafe.
Winter and wet roads
Snow and ice sharply reduce traction, so lower your speed and greatly increase your following distance. Avoid sudden braking or steering that can cause a skid.
Fog and reduced visibility
Use low-beam headlights in fog because high beams reflect back and reduce what you can see. Slow down and be ready to stop within the distance you can see ahead.