M4 Junction 17: Stanton St Quintin (A350, A429)
Junction 17 at Stanton St Quintin links the M4 to the A350 for Chippenham, about four miles south, and the A429 for Malmesbury and Cirencester. It is a rural junction in north Wiltshire. Leigh Delamere Services is between Junctions 17 and 18.
Chippenham and Malmesbury both rely on this junction, for people driving to work, visiting relatives or making a delivery in north Wiltshire. Here is the junction and its recent history together.
Check this junction now: live M4 speed flow map · latest M4 traffic news · M4 serious incidents · M4 accidents
M4 Junction 17 Now: Accidents, Incidents and Roadworks
Live traffic news at M4 Junction 17
Incidents and roadworks between Junction 16 and Junction 18 that we are aware of.
M4 both directions Jct 16 to Jct 17 - lane 3 closure
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
+ 2 more near Junction 17 - see all the M4 traffic news →
This is the news for Junction 17 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 17
The speed strip below shows the M4 around this junction, both directions, from National Highways’ live data, checked every five minutes.
Untick all three to see just the speeds. We show the important overhead signs and the mandatory speed limits (red ring); see every overhead sign.
Go to our live M4 traffic speed flow map ›
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 J17 in Our Records
Most incidents we recorded at J17 were breakdowns or obstructions; 1 of 3 were collisions. In both directions, traffic usually keeps close to its typical speed through the day.
Average speed by hour of day at J17
Westbound
Eastbound
Incidents per week at J17
The latest 3 here
- Sat 17 Oct, 14:37 (2:37pm) Broken Down Vehicle ✓Reported by National Highways
M4 westbound exit slip at junction J17
✓ Cleared after about 12 minutes - Fri 16 Oct, 14:12 (2:12pm) Vehicle Fire ✓Reported by National Highways
M4 eastbound between junctions J17 and J16
✓ Cleared after about 59 minutes - 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)
Built from our own records of National Highways’ live data for the M4 either side of J17: 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.
- Junction M4 J17, Stanton St Quintin
- Roads at this junction A350, A429
- Nearest town Chippenham, 3.9 miles south
- Junction before J16, Spittleborough, about 11.7 miles in a straight line
- Junction after J18, Tormarton Interchange, about 9.9 miles in a straight line
Around M4 Junction 17: Stanton St Quintin: Towns and Places on the Map
