If there's is a tornado and you are in your car then you should leave and search for the best available shelter. Usually that would be a ditch on the side of the road.
Generally not. If a tornado is closing in on you a car is one of the most dangerous places to be. If you are in a car and a tornado is coming close get out of it and seek shelter in a sturdy building. If no such shelter is available take cover in a ditch or depression.
To some degree. You should only take cover in a ditch from a tornado as a last resort if no shelter is available.
If you are caught in the open with no shelter available that is usually the best option.
Seek shelter in appropriate places, like, Bathtub, Closet, etc. If your outside Drainpipe, Ravine, etc. The safest place to be during a tornado is in a basement or other underground shelter.
If there is a tornado happening right at the moment, you probably will be running to saftey/shelter and not packing clothes.
Tornado
A closet can provide good shelter during a tornado.
The safest place during a tornado is in a basement or similar underground shelter.
The best thing to do is abandon the car and seek shelter in a sturdy building. If no shelter is available take cover in a ditch or depression. Do NOT seek shelter under a bridge.
Generally the basement and the bathroom are the safest places to go during a tornado.
schools
No. You do not need to take shelter during a tornado watch. You take shelter if a tornado warning is issued. If you are in a closet shelter you should close the door; it may not provide adequate protection otherwise.