Answer:
When you are inside me you will be encouraged to slam other cars.
I must be broken before you can use me.
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.
What has words but never speaks?
I am a protector. I sit on a bridge. One person can see right through me while others wonder what I hide.
Whatโs a carpetโs favorite sport?