Some two-way roads are divided into three lanes. Why are these particularly dangerous?

Explanation: If you intend to overtake on a two-way road that has three lanes, you must consider that approaching traffic could be planning the same manoeuvre. When you've considered the situation and have decided it's safe, indicate your intentions early. This will show the approaching traffic that you intend to pull out. Some of these roads have solid white lines marked to allow for overtaking in one direction only, usually for uphill traffic.

Category: Band 1 road procedure

References: The Official DVSA Guide to Driving: Section 7, Highway Code: Rule 135