106: A broken white line.
This marks the centre of the road. When this line lengthens and the gaps shorten, it means that there is a hazard ahead. Do not cross it unless you can see the road is clear well ahead and wish to overtake or turn off.
107: Double white lines where the line nearest to you is broken.
This means you may cross the lines to overtake if it is safe, provided you can complete the manoeuvre before reaching a solid white line on your side. White arrows on the road indicate when you need to get back onto your side of the road.
108: Double white lines where the line nearest you is solid.
This means you MUST NOT
cross or straddle it unless it is safe and you need to enter adjoining premises or a side road. You may cross the line if necessary to pass a stationary vehicle, or overtake a pedal cycle, horse or road maintenance vehicle, if they are travelling at 10mph or less.
Laws RTA sect 36 & TSRGD regs 10 & 26