The load index on a tyre is set for a fully loaded car, and the reason it exists is that overloading is one of the more reliable ways to burst a tyre. Every tyre has a maximum weight it may carry at its rated pressure. Exceed it and the sidewall deflects further than it was designed to on every revolution, which builds heat exactly the way underinflation does, only faster. Add a hot day and a long run at a steady seventy and you have created the conditions the tyre was never tested for.
The common version of this is not deliberate. It is a full family, a boot packed to the roof, and pressures still set for one person going to work. Most cars carry two pressure figures on the door plate for precisely this reason, a normal figure and a laden one, and almost nobody uses the second. Before a long run with a full car, use the laden figure. Around Harpenden that means before the M1 at junction 9 rather than after. If a tyre does let go, hold the wheel, ease off the throttle and steer left as the speed drops. We come out to roadside bursts across Harpenden day and night with stock aboard.
People ask whether we can really fit a tyre at the roadside. So a burst tyre on Lower Luton Road or on a hard shoulder gets the same job as one on a driveway: off, on, balanced, pressures set. A Batford cul-de-sac or a Kinsbourne Green main road, tell us which. A tight terrace in Rothamsted or a narrow bay on Luton Road is usually workable.
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Harpenden sits between two M1 junctions and a great many local journeys start as a fully loaded car heading for a long run. That is the trip where the laden pressure figure on the door plate stops being trivia. Five minutes with an airline before you join at junction 9 is the cheapest insurance against a heat failure there is.
The tyres are near their limit and the pressures are still set for a single commuter. That combination on a hot motorway run is how a tyre gets to a temperature it cannot survive.
One for normal use and one for a laden car. The second one exists for exactly this trip, and using it takes five minutes at a garage before you set off.
Fully loaded, at speed, and a corner drops. Straight line, off the throttle, no hard braking, and onto the hard shoulder before anybody gets out of the car.
Yes. Beyond its rated load the sidewall flexes further on every revolution and generates heat it cannot shed, which is the same mechanism as running badly underinflated.
On the plate in the driver's door shut, usually as a second column alongside the normal figures. Most cars list one, and almost nobody uses it.
Less so. It is sustained speed with a full load that does the damage, so it is the long motorway run with everybody aboard that warrants checking.
Yes, 24 hours a day at junctions 9 and 10 and across Harpenden itself, with roadside calls on the motorway prioritised.
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