Final answer:
When driving in poor weather conditions with limited visibility, such as rain, fog, or snow, you must reduce your speed. A common guideline is not to drive faster than 30 mph if you can't see more than 200 feet ahead.
Step-by-step explanation:
In conditions such as rain, fog, or snow, visibility can be significantly reduced, sometimes to the point where you may not be able to see more than a few hundred feet ahead. In these situations, it is imperative to adjust your driving speed accordingly to ensure safety. While specific visibility-to-speed ratios can vary by region and road, a common guideline might be that if you cannot see further than 200 feet ahead, you should not be driving faster than 30 mph. This precaution helps to provide sufficient reaction time to avoid obstacles or changes in driving conditions. It's also worth noting that local traffic laws often mandate slower speeds in poor visibility conditions, so it is essential to be aware of and adhere to such regulations.
When visibility is limited due to rain, fog, or snow, you may not be able to see much more than a certain distance ahead, typically a few feet. In such conditions, it is unsafe to drive faster than a certain speed, which depends on the specific weather conditions and road conditions. For example, if visibility is limited to just a few feet, it would not be safe to drive faster than a few miles per hour.