The major stream has priority to cross the intersection without dodging the minor stream on non-signalized "T", four-arm intersections, or conventional roundabouts. When minor stream vehicles approach an intersection, they should at the very least slow down (yield sign) or stop (stop sign) and check to see if there is an adequate gap in the major stream. What allowable gap is there at your intersection? We'll demonstrate how to use the survey results to find out more.
For the purpose of assessing the intersection service level, measuring vehicle delay is quite important. The actual delay, though, might just be a result of vehicle gaps on both major and smaller streams. Small gaps on main streams result in longer delays in traffic on minor streams, whereas small gaps on smaller streams result in even longer queues there. When combined, they significantly reduce the level of service and frequently result in the suggestion that an intersection be made signal-controlled.