M3 Traffic Latest Update Today: Police-Led Incident Closes Southbound Motorway Near Eastleigh; Check Affected Roads, Diversion Routes, Traffic Delays, Expected Reopening Time & More

M3 Traffic Latest Update Today: Motorists are dealing with delays on the M3 today, October 12, following a police-led incident near Junction 12 at Eastleigh that has closed the southbound carriageway. This has caused the southbound carriageway to shut down. Traffic jams are said to be going all the way to Junction 9 near Winchester. This is causing problems on roads and other routes people use.  Here are all the details drivers should know.

M3 Traffic Latest Update Today: Why Is the M3 Experiencing Heavy Traffic Delays?

The disruption is linked to a police-led incident that has required the M3 southbound carriageway to close near Junction 12. Traffic is being diverted off the motorway, creating the potential for queues around the exit and on connecting roads. Police investigation work can also delay reopening while emergency services complete the necessary procedures. The duration of the disruption will depend on when the authorities can safely clear the affected section. 

Which Roads and Routes Are Affected by the M3 Closure?

M3 Southbound: Closed near Junction 12 (Eastleigh), with traffic diverted off the motorway.

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A335 (Eastleigh): May experience additional traffic as motorists leave the M3 and use connecting roads.

M3 Junction 9 (Winnall / Winchester North): Southbound queues are reported to extend towards Winchester.