The blood-alcohol limit for drivers should be lowered to prevent more unnecessary road deaths, says one of New Zealand's most experienced police officers.

Aucklanders are being warned to expect all-day traffic congestion - even if enough money can be raised for pressure-relieving transport schemes.

Auckland teenager Mitch Evans made a stunning debut in GP2 at the Malaysian Grand Prix yesterday, finishing on the podium in just his second race in the more powerful F1 feeder category.