M4 Junction 18: Tormarton Interchange (A46) – Collision Now

Map of M4 Junction 18: Tormarton Interchange — M4 Junction 18: Tormarton Interchange. Map data © OpenStreetMap contributors. Map drawing © Corporate Ace Limited.

Junction 18 at Tormarton links the M4 to the A46 for Bath to the south and Stroud to the north. Tormarton and Dodington are beside it, and Chipping Sodbury is about three miles north-west. Bath city centre is about ten miles south down the A46.

Visitors heading for Bath, walkers making for the Cotswolds, and people living around Chipping Sodbury leave the M4 here. A look at this page before you set off shows how the junction has been running.

Check this junction now: live M4 speed flow map · latest M4 traffic news · M4 serious incidents · M4 accidents

M4 Junction 18 Now: Accidents, Incidents and Roadworks

M4 serious incident · Collision

The information we are receiving suggests there has been a collision on the M4 eastbound between junctions J20 and J19. It appears to have started at 18:03 (6:03pm). National Highways expects it to clear by 23:19 (11:19pm).

For more information, read here ›

Live traffic news at M4 Junction 18

Incidents and roadworks between Junction 17 and Junction 19 that we are aware of.

M4 both directions Jct 16 to Jct 17 - lane 3 closure

Active nowUpdateBoth directions

Time now: Wednesday, 21 October 2026, 21:29 (9:29pm)

21:28 (9:28pm)21 Oct 2026reported just now

Location: M4 eastbound between J17 and J16
Direction: Both directions
Lanes closed: Lane closures
Reason: Repair work
Schedule: 20:53 (8:53pm) Wed 21 Oct 2026 → 06:00 (6am) Thu 22 Oct 2026

⏳Expected to clear in ~8h 30m HA planned end: 06:00 (6am) Thu 22 Oct 2026

+ 3 more near Junction 18 - see all the M4 traffic news →

This is the news for Junction 18 only, not the whole M4. For the rest of the motorway see all the latest M4 traffic news, the overhead signs and the speed limits in force now.

Updated 21:29 (9:29pm) Wed 21 Oct 2026

Live Traffic Speeds at M4 Junction 18

The speed strip below shows the M4 around this junction, both directions, from National Highways’ live data, checked every five minutes.

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60 mph +50–5930–4915–29under 15

closedM62connecting motorwayA6A road👈M1our site: tap for its map

services, on the side you can reach them

crashincidentqueueroadworksspeed limitspeed shown on the signsstop-startoverhead sign

reported by drivers, which can’t always be relied onconfirmed by National Highways

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Go to our live M4 traffic speed flow map ›

In an emergency call 999. To report a problem on a motorway, call National Highways on 0300 123 5000 (24 hours).

NOTE: The speed flow, overhead sign messages or other information shown on our live traffic speed flow map is updated every few minutes. We cross check the data and aim to provide warnings if there could be a delay or an inaccurate speed reading. There can be occasions, beyond our control, and despite our best efforts where the speed flow could be inaccurate. We cannot therefore guarantee the speed you can expect on any stretch of the motorway is always accurately shown. However we hope you will find our live traffic speed flow map a useful tool in trying to plan your journey. Safe driving.

All the latest M4 traffic news →Live M4 traffic speed flow map →

M4 J18 in Our Records

Incidents here, last 13 days53 collisions, 2 breakdowns or obstructions

Typical time to clearabout 3.5 hoursthe middle value of 5 cleared

Slowest daytime hour westbound08:00–09:00average 61 mph (typical 64 mph)

Slowest daytime hour eastbound11:00–12:00average 62 mph (typical 65 mph)

More than half of the incidents we recorded at J18 were collisions (3 of 5). In both directions, traffic usually keeps close to its typical speed through the day.

Average speed by hour of day at J18

our average, last 13 daysNational Highways’ typical speed

Westbound

Eastbound

Incidents per week at J18

collisionsbreakdowns and obstructions* part week: we started recording during it

The latest 5 here

Wed 21 Oct, 07:17 (7:17am) Collision ✓Reported by National Highways
M4 westbound between junctions J18 and J19
✓ Cleared after about 3 minutes
Mon 19 Oct, 07:35 (7:35am) Spillage ✓Reported by National Highways
M4 eastbound between junctions J19 and J18
✓ Cleared after about 206 minutes (3.43 hours)
Mon 19 Oct, 06:22 (6:22am) Collision ✓Reported by National Highways
M4 westbound between junctions J18 and J19
✓ Cleared after about 279 minutes (4.65 hours)
Tue 13 Oct, 10:08 (10:08am) Collision ✓Reported by National Highways
M4 eastbound between junctions J18 and J17
✓ Cleared after about 236 minutes (3.93 hours)
Sat 10 Oct, 15:06 (3:06pm) Broken Down Vehicle ✓Reported by National Highways
M4 eastbound exit slip at junction J18
✓ Cleared after about 8 minutes

Built from our own records of National Highways’ live data for the M4 either side of J18: speeds from 13 days of five-minute readings, incidents from the last 13 days (we started recording incidents on 09/10/2026). Each incident is counted once. Updated every five minutes.