Speed adjustments on the highway are necessary because of what three factors? name them and describe why they alter the driving task.

Speed adjustment is necessary in highways because of three factors such as:
weather conditions: when there is a presence of heavy rain or heavy snow fall, it is advisable that the drivers should follow a certain speed limit to prevent accidents from happening.
traffics and traffic signs: it is likely to follow the speed limit in traffic to prevent any accidents from happening as well as the traffic signs because not following the rules are punishable by law.
emergency vehicles: it is best to give way or to slow down and give way to fellow emergency vehicles because they have a responsibility in serving people especially in an emergency.

It's if you can't see their account. much like a twitter block, they might tell you.