Traffic Rules

From the sunset until the sunrise, honking has to be replaced with normal light (low beam) and far-light (high beam) alternatively.

ចាប់ពីពេលថ្ងៃលិចរហូតដល់ថ្ងៃរះ ការបន្លឺសញ្ញាសូរស័ព្ទត្រូវជំនួសដោយសញ្ញាភ្លើងកូតហ្វាឆ្លាស់គ្នា ។

In plain language

At night, from sunset to sunrise, use your headlights (flashing between low and high beams) to signal instead of your horn.

4. From the sunset until the sunrise, honking has to be replaced with normal light (low beam) and far-light (high beam) alternatively.

This is important for safety and to avoid noise pollution at night. Practice flashing your lights.

Common confusion: Drivers might still use the horn at night, but the rule clearly states to use lights instead.

Khmer term: ចាប់ពីពេលថ្ងៃលិចរហូតដល់ថ្ងៃរះ ការបន្លឺសញ្ញាសូរស័ព្ទត្រូវជំនួសដោយសញ្ញាភ្លើងកូតហ្វាឆ្លាស់គ្នា ។
Literal translation: From sunset until sunrise, sounding the horn must be replaced by alternating low beam and high beam lights.
Road Law article: 29
Confidence: high

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