A citybound truck broke down in the middle lane of the Southern Motorway on the Newmarket Viaduct about 8.35am.
Earlier, a truck broke down just before 6.30am near the Southern Motorway's Orams Rd overbridge, after Manukau, blocking a southbound lane.
Tow services removed the truck shortly before 8am, but there is heavy congestion in the area.
About 6.45am, emergency services were called to a crash just after the Redoubt Rd on-ramp.
The crash is blocking the middle southbound lane and is also adding to congestion.
Those west of the city can also expect delays after a crash westbound on the Northwestern Motorway, just after the Lincoln Rd off-ramp, shortly before 7am.
The NZ Transport Agency says although the crash was quickly cleared but a "heavy patch'' of traffic is expected from Te Atatu to Lincoln Rd.