The difference between traffic lights with red arrows and those with solid red lights is:

Red arrows are only used to stop vehicles turning left.
Red arrows apply only to buses and trucks.
Red arrows are only used for limited-access lanes.
Drivers cannot turn on a red arrow, even if they stop first.
Explanation

Unlike a solid red light, which may allow right turns after a complete stop, a red arrow indicates that you must come to a complete stop and cannot turn in the direction of the arrow until the light changes to green. This rule ensures safety by clearly marking which directions are prohibited for turns.

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