Because the vulnerable roadway users will be paying less attention as they will be trying to get out of the weather.
Of all weather conditions, fog is perhaps the most dangerous. So if you are driving in fog, slow down and turn on your headlights. When the fog thickens and you can barely see, get off the road safely and completely.
Sound your horn or flash your lights to alert other drivers to your presence and avoid a collision. If there is a danger or accident ahead, the brake light flashes to warn the following vehicles. Use your horn only if there is no other way to avoid a collision.
Learn more about vulnerable roadway here: https://brainly.com/question/12419093
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