I need help please. Give me a few sentences at least and I will give u brainlist.

Why is the supremacy clause considered to be the root of federalism?

1. once you decide that it is safe to move out of traffic, what steps should you follow to ensure safe passage? 2. give some examples where it is unsafe to travel at the speed limit 3. when parking downhill with a curb, what steps would you follow with an automatic transmission? what about manual transmission? 4. what are three things you can do to safely leave a vehicle? ! its due in 3 hours! 100 points to anyone who can at least with one : (

Speed limit signs indicate the maximum legal speed