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Two post sections, as in, the cars are each at a post and there is one post between them, is often a good distance on a highway. Therefore:
POST + 50 metres + POST + 50 metres + POST
On the left of the picture, it may be difficult to see if there is another post between the cars. On the right however, it is easy to see that this is not the case. The car furthest back should therefore reduce its speed so that the distance is doubled.
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