"This is more evidence of this Government's blind irrationality when it comes to public transport," he said yesterday.
The Treasury paper points to 2019-20 as the target date for completing the rest of the roading components, including sweeping motorway-to-motorway ramps above Constellation Drive, but gives no indication when the busway will be extended.
But it reports Transport Agency advice that investigations and route projection for the busway - expected ultimately to run alongside the motorway to the east - can continue without extra financial help.
A spokesman for Transport Minister Gerry Brownlee said last night that although a $350 million Government loan to the agency for motorway improvements did not provide for the busway extension, the project "has not been dropped from the list of projects that may be considered for acceleration in the future".
But Auckland transport blogger Matt Lowrie said agency officials had indicated to him their surprise that busway funding had been excluded.
The busway snub has disappointed former North Shore mayor George Wood, now an Auckland councillor. Mr Wood, under whose mayoralty the existing 6.5km two-lane busway was built from Takapuna to Constellation Drive for $300 million, said he was "immensely" disappointed by the knockback.