Emergency mobile tyre fitting on the A308(M)
Ease off rather than braking hard, because the A308(M) covers barely half a mile between the M4 and Maidenhead with a roundabout waiting at each end. Pull up short of Braywick or Holyport, get behind the barrier, and a fitter can reach you there from £120.
If you are in a live lane, do not attempt a tyre change
The A308(M) carries no all-lane running and no smart motorway technology. It is barely over half a mile long with a roundabout at each end, Holyport and Braywick, so a car in trouble is never more than a few hundred metres from a way off the running lanes. Get the vehicle as far left as you can, leave by the nearside doors, stand behind the barrier up the embankment, and call National Highways on 0300 123 5000, or 999 if you cannot get out of the vehicle. They can close the lane above you from the control room. Book a fitter once you are behind a barrier, never before. Full guidance is on National Highways.
On the A308(M), aim for Braywick roundabout or the Holyport interchange rather than stopping mid-span, then stand well behind the barrier. Ring National Highways on 0300 123 5000, or dial 999 straight away if you cannot get clear. A mobile tyre fit on the A308(M) starts from £120.
The A308(M) was built in 1971 as part of the Maidenhead bypass, when the M4 was extended west and the original junction 8 closed. What remained became this short spur, running from the M4 at junction 8/9 at Holyport to the A308 at Braywick, sharing its western roundabout with the A404(M). At around a kilometre, it is reckoned Britain's second shortest motorway after the A635(M) in Manchester.
Two lanes run each way over one straight section and one gentle curve near the Braywick end, so the eastbound carriageway is marginally the longer. Most traffic has just left the M4 at speed and is braking hard into the roundabout, decanting toward Maidenhead centre or on toward Windsor and Ascot. There is rarely enough distance left on a road this short for a slow puncture to announce itself gradually; whatever a tyre picked up on the motorway tends to show itself here first.
Where A308(M) tyre failures concentrate
A308(M) Maidenhead spur, 0.6 miles, M4 J8/9 Holyport to Braywick Roundabout, through Berkshire, serving Maidenhead, Holyport, Bray and Braywick.
The curve near Braywick
The A308(M)'s single bend sits at the Braywick end, where the eastbound carriageway runs the long way round. Cornering load through it, right as drivers ease off after leaving the motorway, is where a tyre already weakened on the M4 tends to let go.
Holyport interchange with the M4
A grade-separated roundabout shared with the A404(M) and M4 junction 8/9, where three roads' worth of traffic merges in a small footprint. Debris off all three tends to collect here.
The full length itself
At under a mile, there is not enough road for a slow deflation to build gradually. Anything wrong with a tyre coming off the M4 usually reveals itself here rather than further on toward Maidenhead.
A308(M) services we cover
If you can reach a service area safely, do. A fitter can work on you in a car park with no live traffic alongside, which is both faster and far safer than a hard shoulder.
| Service area | Between |
|---|
A308(M) tyre prices
Callout and labour are covered by the single figure quoted, and the tyre itself goes on top at cost, itemised before you say yes so nothing arrives as a surprise. A 1.5x multiplier lands on the base rate overnight, 23:00 to 07:00, which is how 24 hour tyre fitting on the A308(M) stays available even on a spur this small.
| Service | Price | What is included |
|---|---|---|
| Mobile tyre change, supply and fit | From £120 | The tyre is priced separately at cost. Given how close this spur sits to Maidenhead, common car sizes are held locally and reach either end quickly. |
| Fit the spare you already carry | From £80 | A road this short has no services to aim for, so getting your own spare on is usually quickest, leaving you to drive into Maidenhead unassisted. |
| Puncture repair | From £60 | Assessed against British Standard AU159's central repair zone; the damage has to sit inside it and tread has to clear the legal minimum. |
| Locking wheel nut removal | From £70 | Covers a lost or rounded key on the wheel nut. The fitter starts with a non-destructive extraction technique before trying anything stronger. |
Flat tyre on the A308(M): what to do
Go left: ease off, do not brake hard
The instant something feels wrong, ease off rather than stamping on the brakes, and coast toward whichever roundabout, Holyport or Braywick, is nearer.
Get safe: aim the wheels off-carriageway
If neither roundabout is within reach, get the car as far off the running lane as the surface allows and point the front wheels toward the verge, away from passing traffic.
Get safe: out through the passenger doors
Switch the hazards on the moment you stop. Everybody gets out on the passenger side, the driver too, and nobody steps toward the carriageway.
Get safe: clear the barrier
Climb past the barrier and wait ahead of the car rather than beside it, out of the way of anything that strikes the vehicle.
Get help: 0300 123 5000, or 999
Ring National Highways on 0300 123 5000 and tell them whether Holyport or Braywick is closer. If you cannot get clear of the vehicle, dial 999 instead.
Then book the fitter
With the barrier between you and the traffic, open the app and book. The GPS pin does the work of naming your spot on a road too short for a marker post.
The legal minimum tread depth in the UK is 1.6mm across the central three quarters of the tyre, and the fine is up to £2,500 and three penalty points per tyre. A fitter cannot legally refit a tyre below that, which is why a worn tyre becomes a replacement rather than a repair.
What drives the A308(M), and what fails
M4 traffic decanting toward Maidenhead
Most vehicles here have just left the M4 at speed and are braking hard into the Holyport roundabout. A tyre already marginal on the motorway often fails under that sudden change of load.
Local trips between Holyport, Bray and Maidenhead
Short hops that rarely bring a tyre up to normal operating temperature, so underinflation goes unnoticed for longer than it would on a longer run and tends to show up as sidewall cracking rather than even tread wear.
A308(M) tyre failures through the year
Winter, standing water near Braywick
Low ground at the Braywick end collects surface water after heavy rain, and driving through it right where the road narrows into the curve is a recurring cause of sudden tyre and wheel damage.
Summer, Windsor and Ascot traffic building
The A308 beyond Braywick is a main route toward Windsor and the Ascot area, so summer weekends add fully loaded family cars and unfamiliar drivers to what is normally a quiet commuter link.
Getting a tyre near the A308(M)
A road this short has no room for a service area of its own. Maidenhead centre sits within a mile of Braywick, and a fitter working in a retail car park there is safer, and no slower, than a hard shoulder job on a six hundred metre spur.
Fitters are based across Maidenhead and the wider Windsor and Slough area. Target arrival on a spur this close to the M4 tends to be quick, though it remains a target rather than a guarantee.
Tread, pressure and the law
1.6mm, checked across the whole tyre
Tread depth is measured across the central three-quarters of the tyre's width, all the way round, not from a single spot chosen at random.
Each illegal tyre is its own offence
Fines run up to £2,500 with three penalty points, applied per tyre rather than per car, so four bald tyres carries a theoretical ban.
A sidewall cut ends the tyre, not the MOT wait
Any cut, bulge or exposed cord fails an MOT test outright, whatever the tread depth reads, and there is no repair for it.
A308(M) tyre questions
Can you change a tyre on the hard shoulder of the A308(M)?
The road is so short, barely over half a mile, that the better target is one of the roundabouts at either end, Holyport or Braywick, where there is genuinely more room to work. If neither is reachable, fitters work on the verge where it is safe, with you behind the barrier throughout.
Who do I call for a flat tyre on the A308(M)?
Once you are safely behind the barrier, National Highways takes the call on 0300 123 5000; tell them whether you are nearer Holyport or Braywick. If you cannot get out of the vehicle at all, ring 999 first instead.
Is it illegal to change a tyre on the motorway?
It is not an offence, but National Highways advises against it. Traffic here is moving at full speed right up to the roundabout, leaving very little margin for anyone working at the offside wheel.
How much does emergency tyre fitting on the A308(M) cost?
From £120 for a roadside change including callout and labour, with the tyre charged at cost and shown before you confirm. Fitting your own spare is from £80, and a repair from £60 where the damage allows it.
What if there is no hard shoulder on my stretch of the A308(M)?
The practical answer is the same everywhere on this road: ease toward Holyport or Braywick roundabout rather than trying to identify a shoulder. If the car has stopped in a running lane and will not move, call 999.
Do you cover Maidenhead as well as the motorway itself?
Yes. Maidenhead, Holyport and Bray all sit within a mile or two and are covered on the same terms, which matters given there is nowhere on the spur itself to wait comfortably.
Book a A308(M) tyre fitter in the app
Your location comes from GPS, so you do not have to read a marker post. The price is fixed before you confirm and you track the fitter in.
Download free
iOS and Android from the 1st of October 2026. No membership, no annual fee and no account charge. You only pay when you book a job.
Book securely
The fixed price is shown before you confirm, not after the work. Card, Apple Pay and Google Pay are handled in-app, so no cash changes hands at the kerb.
Track the driver
Once a job is accepted you see the driver's name, vehicle and live position on the map, with an arrival time that updates as they travel.
Every operator is DBS checked, insured for hire and reward, and rated after each job. Prices are fixed before dispatch, never quoted as a range.
Own a van or recovery truck? Take jobs through the same appMobile tyre fitters wanted on the A308(M)
Under a mile and feeding straight off the M4, the A308(M) sends a steady trickle of Maidenhead-bound traffic your way, so most fitters cover it as part of a wider Maidenhead and Windsor patch. Fitters keep 90 percent of every job for their first twelve months, with no joining fee, no weekly subscription, no bidding and no charge for jobs you decline. You set your own radius and hours. We are signing up fitters along the A308(M) ahead of the 1st of October 2026 launch.
Cover the A308(M) with usTom Hargreaves - Head of Recovery Standards
Tom spent 12 years patrolling UK motorways with the AA before joining TowManVan. He signs off the roadside safety guidance and every price on this page. Questions? Email tom@towmanvan.co.uk.
Last updated 19 August 2026. Apps launch 1st of October 2026.