Answer:
When you are inside me you will be encouraged to slam other cars.
What is seen in the middle of March and April that cannot be seen at the beginning or end of either month?
I shift around though always slowly. I never move more than a few inches at a time. A large movement by me can kill many people. I am huge yet unseen by humans.
I save lives on the ground and in the air
I am the kind of ant that's good at math.
When is it bad luck to see a black cat?