Traffic Rules and Priority
The default priority rule
In Belgium, when there is no sign, marking or traffic light, the driver coming from the right has priority. This is the backbone of many exam questions. Remember that it also applies at junctions where a road simply joins another without any sign.
Signs and lights change the rule
A give-way or stop sign removes the priority-to-the-right rule for that junction. A priority road sign gives you right of way over traffic from side roads. Traffic lights override signs, and a police officer overrides everything. When turning left, you must give way to oncoming traffic going straight or turning right.
Roundabouts
At a roundabout you generally yield to traffic already circulating. Signal right before your exit, and signal left only where required by local layout. Do not change lanes inside the roundabout without checking and signalling. A common trap is assuming a roundabout always gives you priority; check the signs at the entry.
Pedestrians and crossings
At a zebra crossing you must yield to pedestrians who are on it or clearly about to step onto it. When turning into a side road, yield to pedestrians crossing that road. Overtaking at a pedestrian crossing is prohibited.
Worked example
You ride on an unsigned road and reach a T-junction where a car approaches from a side road on your right. The car has priority, so you slow and yield. If instead that side road had a give-way sign, you would keep your right of way but stay ready to react.