Junction 10 sits on the eastern edge of Winchester at Chilcomb, in the cutting through Twyford Down. The two stretches meeting here carry more lorries than anywhere else on the M3.

How busy is the M3 at Junction 10?

Both stretches either side of Junction 10 are physically counted by the Department for Transport. These are the 2025 figures.

How busy is the M3 at Junction 10?

Stretch	Length	Vehicles per day	Lorries	Lorry share
J9 down to J10	1.4 miles	110,741	10,404	9.4%
J10 to J11 Compton	0.8 miles	126,217	11,545	9.1%

© M3Traffic.co.uk · Statistics from the Department for Transport

The short run from J10 to J11 is the 4th busiest of the 24 links the Department for Transport measures on the M3, and it carries more lorries than any other — 11,545 a day. The stretch immediately above it has the highest lorry share at 9.4%. Two different measures, two different answers, and both matter if you drive this road: volume tells you how full it is, share tells you what you will be sharing it with.

It is also the most evenly balanced stretch on the whole motorway — 63,364 one way against 62,853 the other, a difference of just 0.8%. This piece of road is busy in both directions, all day.

Vans add a further 21,990 a day. Together, lorries and vans are more than one vehicle in four here.