One major step in ensuring the safety of vehicles is a requirement (common in many states, and in many other countries) for vehicles to be inspected regularly.
(One major step in ensuring the safety of vehicles; is; a requirement (common in many states, and in many other countries) (vehicles; to be inspected regularly; )
One major step in ensuring the safety of vehicles vehicles
is to be inspected regularly
a requirement (common in many states, and in many other countries