Final answer:
All of the statements about speed management are true, including reducing speed on wet roads and packed snow, as well as the increased difficulty of stopping and turning on slippery roads.
Step-by-step explanation:
All of the above statements about speed management are true. When the road is slippery, it will take longer to stop and it will be harder to turn without skidding. On a wet road, you should reduce your speed by about one third, and on packed snow, you should reduce your speed by about one half.