3 inches
It depends on local legislation . Some countries have no restrictions.
This answer will depend on which state you are asking about.
3 inches
Actually its 3 inches for the left side and 6 inches for the right side.
Actually its 3 inches for the left side and 6 inches for the right side.
Total width can't exceed 84".
12 inches
The maximum number of extendable inches will vary from state to state. You will need to check with the local authorities for the laws of your state.
12
12
12 inches
3 inches
3
3 inches