Under what circumstances must you drive slower than the posted speed limit?

Driving slower than the posted speed limit is essential for safety, especially in bad weather and/or heavy traffic. When conditions are unfavorable, such as during rain, snow, fog, or heavy traffic congestion, the likelihood of accidents increases. Reduced visibility, slippery roads, and the presence of more vehicles on the road require drivers to adjust their speed to maintain control of the vehicle and the ability to react to unforeseen situations.

In these scenarios, adhering to the speed limit may not be sufficient, as the conditions necessitate a more cautious approach. This practice not only helps in preventing collisions but also allows for better reaction times to road hazards or sudden changes in traffic conditions.