Dipped beamUnited Kingdom
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161. Dipped beam
Dipped beam is the low-beam setting of a vehicle's headlights. It illuminates the road ahead while directing the light downward so that it is less likely to dazzle drivers and other road users.
Dipped-beam headlights are normally used at night, in poor visibility and whenever main beam could dazzle another road user. They provide less illumination than main beam but are suitable for normal driving when other traffic is nearby.
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When does the British Highway Code recommend dipped headlights?
Use dipped headlights at night in built-up areas and in dull daytime conditions; headlights are mandatory when visibility is seriously reduced. Dip the beam so it does not dazzle other road users.

Traffic rules
United Kingdom