What is happening at M3 Junction 9 and when?

National Highways has closed the M3 near Winchester for Junction 9 bridge works on 3 February, with both directions shut and a signed 16 mile A34 A303 diversion. Heavy freight is advised to use the A3. Another weekend closure is planned in mid February, with exact dates pending.

Which routes should drivers and logistics teams use?

Follow the signed A34 A303 diversion for light vehicles and general traffic. For heavy freight, National Highways advises the A3 to reduce pressure near Winchester. Allow extra time, re time runs outside peaks, and check regional updates before travel, as reopening times can change with on site progress.

Why does this matter to Japanese investors?

The M3 Junction 9 closure can delay loads moving between inland hubs and southern ports that serve UK retail and e commerce. Detours add distance and fuel burn in GBP, which can raise yen costs if hedges are light. The upgrade also reflects sustained UK road capex through 2030.

What actions should companies take this month?

Adjust routing to use the A3 for heavy trucks, add buffer stock for fast movers, and update customer cut off times. Coordinate driver hours to absorb longer routes. Track GBPJPY and diesel prices, plus delivery performance metrics, until the mid February closure passes and normal patterns return.

Global Market Insights

February 03: M3 Junction 9 Closure Forces 16-mile Diversion, Freight Watch

ByDanny Kontos February 3, 2026February 3, 2026

The M3 Junction 9 closure near Winchester is in force this weekend, sending drivers on a 16 mile A34/A303 diversion while heavy freight is advised to use the A3. National Highways works focus on bridge upgrades and a wider junction to ease future flows. Another weekend closure is expected in mid February. For Japanese investors, this event highlights short term logistics costs around southern ports, with long term benefits from the UK’s road investment program running through 2030.