Drivers joining the M3 northbound near Winchester need a slightly different plan this Thursday morning. National Highways says the M3 junction 9 northbound entry slip road is closed from 9pm on Friday 31 July 2026 until winter 2027 as part of the junction improvement programme. This means there is no access to the M3 northbound from the junction 9 roundabout, although through traffic on the M3 mainline is not automatically stopped by the long-term slip-road closure.
What the closure means for a morning journey
If your usual route reaches junction 9 from Winchester, the A34, A33 or nearby local roads and then joins the M3 northbound, do not rely on habit. Check your navigation and the official traffic information before leaving, then follow the signed route to another suitable northbound entry point. Allow extra time for local congestion, especially around the morning peak, and avoid making a late lane change when you realise the familiar slip road is unavailable.
Drivers already travelling north on the M3 should still check live conditions. National Highways notes that roadworks and closures can change at short notice, and separate overnight restrictions may operate as work progresses. The safest approach is to review the official daily closures and travel alerts shortly before departure rather than assuming yesterday’s arrangement is unchanged.
A five-minute vehicle check before you leave
A short check at home can prevent a small delay from becoming a stressful roadside problem. Confirm that your fuel or battery range comfortably covers the journey and any diversion. Check tyre condition and pressures, washer fluid, lights and windscreen visibility. Set the route before moving, download or note an alternative in case mobile coverage drops, and tell anyone meeting you that arrival times may vary.
Keep drinking water, a charged phone and charging cable within reach. If you are travelling with children, an older passenger or a pet, add a planned comfort stop rather than waiting until the route becomes busy. A calm, prepared departure makes it easier to respond to new signs and instructions without distraction.
Pack for a safe roadside wait
Every vehicle should carry a compact emergency set that is easy to reach without unloading the whole boot. Useful basics include a high-visibility vest, warning triangle for locations where it is safe and lawful to use one, a torch, basic first-aid supplies, water and a practical emergency tool. Store the kit in a fixed place and make sure regular passengers know where it is.
Practical JUFO recommendation
The JUFO 3-in-1 Roadside Breakdown Kit costs £17.95 and combines a high-visibility vest, warning triangle and 2-in-1 emergency tool in one compact set. It is a sensible fit for motorway preparation, weather disruption and unexpected roadside stops.
If your vehicle develops a problem, move to a safer place only when it is possible to do so without increasing risk. Switch on hazard lights, follow motorway signs and official guidance, and contact the appropriate breakdown or emergency service. Never stand in a live traffic lane, and do not attempt a repair in an exposed position.
Check once more before the return trip
The junction 9 programme is a long-running change, not a one-morning event. Save the official project page, update anyone else who drives the same vehicle, and build the closure into future route planning. For the latest details, read the National Highways M3 junction 9 improvements page and its linked daily closure information before each journey.
A few minutes of planning will not remove every delay, but it can reduce rushed decisions. Leave with a checked route, adequate range and a reachable roadside kit, then follow live signs and instructions throughout the journey.
