Updated‌Tailbacks at SH1 Park Estate Rd Overbridge just before 8.40am following the crash. Photo / NZ Transport AgencyTailbacks at SH1 Park Estate Rd Overbridge just before 8.40am following the crash. Photo / NZ Transport AgencyMotorists have been warned to expect “major delays” after a multi-vehicle crash that has reduced southbound traffic to one lane on Auckland’s Southern Motorway at Drury.

By 9.15am, a 7km tailback had already formed in the southbound lanes between Drury and just after the motorway passes