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What procedure should I adopt when driving under these weather conditions?

When driving in adverse weather conditions, such as the dense fog visible in the image, the driver must adjust the vehicle's speed to ensure they can stop safely within the clear and visible space ahead. This adjustment is fundamental for maintaining road safety in the face of significantly reduced visibility. The remaining options are incorrect because there is no fixed speed limit applicable to all fog situations; the speed should be adjusted to the specific case. Additionally, driving close to the center line of the carriageway is dangerous, as it increases the risk of collision with oncoming vehicles, and the driver should stay as close as possible to the right shoulder.