<P> A 3 - way junction (or 3 - way intersection) is a type of road intersection with three arms . A Y junction (or Y intersection) generally has 3 arms of equal size . A T junction (or T intersection) also has 3 arms, but one of the arms is generally a minor road connecting to larger road . </P> <P> Some T junctions are controlled by traffic lights, but others rely upon drivers to obey right - of - way rules, which vary from place to place . For example, in some jurisdictions, vehicles on the right always have the right - of - way (even at T junctions), while in other jurisdictions, vehicles travelling on the "through" road of a T junction have the right - of - way, meaning that vehicles approaching the "major" road must allow through traffic to pass before joining the flow of traffic . </P>

Who has the right of way at a three-way intersection