When it comes to right-of-way, "first in, first out" means priority to go first.
Explanation:
Traffic discipline is one of the best behaviours to be maintaining the society. If we obey the traffic regulation then there won’t be any traffic jams on busy roads. In traffic laws right of way is a regulation which is applicable when there is no signal.
For an example in a four way road intersection the vehicle which come first will have the priority to choose the way it known as first-in first-out. That is he or she will be given the preference to move ahead first to select the direction of drive. This action of driving on the road is called the Right of way .