High beamBelgium
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159. High beam
High beam, also called main beam, is the headlight setting designed to illuminate the road a long distance ahead. It provides stronger and farther-reaching illumination than dipped beam but can dazzle other road users if used incorrectly.
High beam is mainly useful on dark roads where there is no nearby traffic that could be dazzled. Drivers must switch to dipped beam whenever required by traffic conditions or national rules.
Wikimedia.org • Ehsnils • CC BY-SA
When may you use high beam in Belgium?
High beam may be used when vehicle lighting is required and none of the situations requiring dipped beam applies. It is particularly useful on dark roads where it can be used without dazzling other road users.
When must you switch from high beam to dipped beam in Belgium?
You must switch to dipped beam when approaching a road user who could be dazzled, when following another vehicle at less than 50 metres except while overtaking, and when the road is continuously and sufficiently illuminated so that you can see clearly for approximately 100 metres.
Must you dip your high beam if an approaching driver signals that they are dazzled?
Yes. When an approaching driver repeatedly flashes their high beams to indicate that they are being dazzled, you must switch from high beam to dipped beam.

Traffic rules
Belgium