A single “pause” (traffic light, roundabout, stop sign, even just a speed camera or change in speed limit…) in the stretch of the east-west road leading up to t

A single “pause” (traffic light, roundabout, stop sign, even just a speed camera or change in speed limit…) in the stretch of the east-west road leading up to the roundabout can usually solve this. You only need occasional breaks in traffic to allow the secondary traffic to join.