Two systems do almost all the work of keeping you alive: the tyres that grip the road and the brakes that slow you down. Both give warning signs long before they fail, if you know what to look for.
Tyres need enough tread — the legal minimum is 1.6 millimetres across the middle of the tyre. There's a brilliant free test: push a 20p coin into the tread, and if you can still see the coin's outer band, the tread is too low. Tyres also need the right pressure — soft tyres wear out fast and handle badly.
Brakes talk to you. A spongy pedal, a grinding noise, the car pulling to one side, or a brake warning light all mean "get this checked now". Brakes rarely fail suddenly out of nowhere — they usually warn you first, and ignoring the warning is the real danger.
The bits that matter
- Legal tyre tread is at least 1.6 mm — the 20p test checks it in seconds.
- Keep tyres at the right pressure; soft tyres wear fast and handle poorly.
- Spongy, grinding or pulling brakes — or a brake light — mean check them now.
Memory anchor
20p in, rim hidden = tread's fine
Push a 20p coin into your tyre's tread. If the coin's outer rim disappears into the groove, you've got enough tread. If you can see the rim, the tread's too low — time for a new tyre. A coin from your pocket is a legal tyre check.
Out on the road
The wet roundabout on worn tyres
Worn tyres feel fine in the dry — right up until a wet roundabout, when the car slides wide because there isn't enough tread to clear the water. The driver thought the tyres were "probably okay". A 20p test the week before would have told them, calmly, that they weren't.
The mistake everyone makes
Ignoring a brake warning because the car still stops
Brakes that are wearing out still work — until they suddenly don't. A grinding noise or a warning light means the safety margin is gone, even if the car's still stopping today. Brakes are the one thing you never "wait and see" on. Get them checked the moment they speak up.