Correct answer
Buses and taxis may proceed.
According to Article 148(d) of the General Traffic Regulations, an intermittently illuminated white bar, vertical or oblique, on a traffic light intended exclusively for public transport indicates that the vehicles to which it applies must stop under the same conditions as for a steady amber light on a conventional traffic light. It applies only to buses, taxis or other vehicles authorised by that traffic light. It means that they must stop safely before the stop line or stopping place. Other road users must not obey this signal. Summary: intermittent vertical (or oblique) white bar = obligation to stop, equivalent to a steady amber light.
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Buses and taxis must stop.
All vehicles must stop.
Buses and taxis may proceed.
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