Answer:
Two situations when going the speed limit is not considered safe would be in rainy weather conditions, or at night. Visibility is lowered in both the situations, making it dangerous to travel the speed limit. Reaction time is lowered when visibility is not clear. Less reaction time could mean a dangerous situation should you have to make an immediate stop. Do the smart thing and lower your speed limit when driving in bad weather or when it is dark outside, even if you think you'll be fine.
hope this helps :)
