Road markings like a solid yellow (or white, depending on the road) line down the centre of the road aren't arbitrary — they're placed on sections where road authorities have identified limited sightlines, such as a blind rise or a tight bend, making it genuinely unsafe to see far enough ahead to overtake safely. Crossing a solid line to overtake removes your ability to judge whether an oncoming vehicle is hidden just beyond your sightline, which is exactly the scenario these markings are designed to prevent. Understanding the reasoning behind road markings, rather than just memorising them as rules, tends to make drivers far more likely to actually respect them in situations where the temptation to overtake is strong.
Source: National Road Traffic Act 93 of 1996
Frequently Asked Questions
Why are solid line markings placed on certain sections of road?
They mark sections where limited visibility, such as a blind rise or sharp bend, makes it unsafe to judge whether overtaking is genuinely clear.
Is it ever acceptable to cross a solid line to overtake?
As a general road rule, no — the marking exists specifically because visibility isn't sufficient to safely judge oncoming traffic on that stretch.
What's the risk of overtaking on a blind rise?
You can't see whether a vehicle is approaching from the other direction just beyond the rise, making a head-on collision a real risk if you commit to overtaking.
Do road markings differ from one road to another?
Yes — markings are placed based on the specific visibility and hazard conditions of that stretch, which is why the same road can switch between solid and broken lines.