Right of way at junctions, roundabouts and pedestrian crossings
Unsigned junctions
The general rule is the right-hand rule: at an unsigned junction, give way to traffic coming from your right. This applies to tractors the same as to cars. On a signed priority road, traffic on that road has priority, but you must still give way to pedestrians at a marked crossing and to vehicles already in the junction.
Entering from a field or track
A tractor leaving a field, farm track or private area must give way to all traffic already on the public road. There is no agricultural exemption. Stop where visibility is poor, clean mud from the wheels where necessary, and enter only when the road is clear.
Roundabouts
Unless signs say otherwise, give way to traffic already circulating in the roundabout. Signal right before leaving. A large tractor and trailer may need to straddle lanes; check mirrors and do not force a car into the kerb.
Pedestrian crossings
Approach a marked crossing at a speed that lets you stop. Give way to pedestrians on the crossing and to anyone stepping onto it. Do not overtake a vehicle that has stopped at a crossing. When turning into a side road, give way to pedestrians crossing that road.
Worked example
A tractor exits a dirt track onto a main road. A car is approaching from the left. Reasoning: the tractor is entering from a track, so it yields to the car even though the car is on the left. If the junction were unsigned public roads, the right-hand rule would instead give way to the car on the right.
Traps
Assuming a tractor has priority because it is agricultural; applying the right-hand rule when a priority sign exists; failing to yield to circulating traffic in a roundabout; and overtaking at a pedestrian crossing.