Police and other emergency services are currently responding to an incident on the Walmsley Road overbridge.
This incident involves concerns for a person's wellbeing.
As a result, lanes in both directions of the Southwestern Motorway will be closed near the overbridge.
Motorists travelling in the area are advised to take an alternative route before Walmsley Road if at all possible.
Delays are expected this evening.
Jarred Williamson/NZ Police