The one thing not to do here is join the A428. It is the instinct, because the dual carriageway is how everything works in Cambourne and Cambridge or St Neots is where the garages are, but a tyre with no pressure in it cannot merge onto a fast road and it certainly cannot travel one. Getting up to speed is exactly what tears a soft tyre apart, and the slip roads leave you nowhere to retreat to once it starts going wrong. Whatever the estate roads feel like, they are the better place to be stuck.
So if the tyre goes while you are still on the estates around Monkfield or Sheepfold Lane, stay on them and stop. If it goes at the Business Park, leave the car in the bay and carry on with your day around it. If it has already gone on the A428 itself, get fully onto the hard shoulder, out of the car on the nearside and well back from the carriageway, and wait there rather than in the vehicle. When you ring, tell us which direction you were travelling, because on a dual carriageway that decides which side of the road the van needs to be. Typical arrival is 30 to 60 minutes and we come with the tyres already on board.
Flat on the A1198 with nowhere sensible to stop, or flat on the drive at seven in the morning: the answer starts the same way, which is that somebody has to look at it properly. School run in Monkfield or 1am in Sheepfold Lane, we answer the same. Christmas Day in Sheepfold Lane, any day in Monkfield: the line is open.

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Cambourne is built around a commuter route, and that is precisely what makes a flat tyre awkward here. The A428 carries fast, heavy traffic between Cambridge and the A1 and throws up the debris that causes a good share of these calls, the A1198 junction sees plenty of wear, and the estate roads through Great, Lower and Upper Cambourne are busy with school runs but have nothing resembling a fitting bay. The answer is not to weigh the dual carriageway against the estate. It is to stop on whichever one you are on and let a stocked van come to the car.
A driver felt the wheel go on the approach and turned back into the estate rather than committing to the A428. That decision kept a repairable tyre repairable and kept the car off a road it should not have been on.
A flat found at lunchtime with a full day still to work. Nothing needed rearranging. The wheel was changed in the bay and the car was ready to drive home properly at the end of the day.
Something thrown up at speed went through a tread near the junction. The driver got fully onto the shoulder and out of the car, which on that road is the whole of what you can usefully do.
No. Joining the A428 on a damaged tyre is the worst move available, because getting up to speed is what destroys it and there is nowhere to stop once it starts to go. Stay off the dual carriageway and let us come to you.
Not really. It makes the mobile option the obvious one. The van carries the tyres, so being on Sheepfold Lane rather than in a town is not a disadvantage.
No. Get fully off the carriageway and out of the car on the nearside, well back from the traffic. We attend the roadside and change the wheel there, so the car does not need towing anywhere.
Which direction you were travelling and the last junction you passed, along with where you have stopped. On a dual carriageway the direction is the detail that saves the most time.
Yes, day or night. A flat found at home before the commute is the best possible starting point because the car has not been driven on it.
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