Commuters catching buses or car-pooling from Birkenhead to Auckland along Onewa Rd's pioneering high-priority lane may also get faster trips home.

Auckland Transport is seeking public comment on whether to restrict one of the road's two eastbound lanes to vehicles with at least three occupants during afternoon travel peaks, building on the success of the fast track now enjoyed by commuters headed for the harbour bridge in morning traffic.

The council agency hopes to operate a transit 3 (T3) lane from 4pm and 6pm on weekdays along more than half of Onewa Rd, between Church St and Birkenhead Ave.

That follows more than 10 years of running a high priority lane in the other direction, now down Onewa Rd to the motorway interchange.

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Although it will leave less room for single-occupant vehicles, Auckland Transport estimates that buses carry about 41 per cent of people travelling back up Onewa Rd in the afternoons.

It expects cars carrying at least two passengers to boost use of a westbound T3 lane to 48 per cent of people travelling up the road, which carries about 26,000 vehicles daily, making it one of Auckland's busiest routes.

The proposal will mean less parking on the southern side of Onewa Rd. Auckland Transport acknowledges that is likely to be contentious, but promises to minimise the effects by providing parking on side roads, with time restrictions.

Submissions on the proposal close on September 12.

The agency also intends upgrading the Onewa Rd footpath into a shared pedestrian and cycling facility, saying the new transit line will not be wide enough for pedallers using what is part of Auckland's strategic regional biking network.

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To comment on the proposal go to aucklandtransport.govt.nz.