When a green arrow is shown alongside a red light at an intersection, vehicles must stop before proceeding in that direction to ensure safety.
The correct answer is: B Vehicles must stop before going in the direction shown by the arrow.
In traffic light systems, a green arrow displaying simultaneously with a red light indicates that vehicles must come to a complete stop before proceeding in the direction specified by the arrow.
Ignoring this rule can lead to dangerous accidents and violations of traffic laws.
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