The answers to the clues below will have something in common. Can you determine what it is?

1. Go from third to fourth, for example
2. Contract provision, perhaps
3. Police challenge at a large event
4. Sign indicating where to go in
5. Gas pump direction

Answers:

1. Shift gears
2. Escape clause
3. Crowd control
4. Enter here
5. Insert card - - - Each answer contains a word that is also a computer key.