The day for the 117 Howick & Eastern drivers, represented by First Union, was exhausting, organiser Rudd Hughes said last night.
He said the object of the strike wasn't to disrupt traffic, but to get companies to come back to the table to negotiate.
There had been no progress with Howick & Eastern, however.
"We set up a walking picket and they just drove straight through."
He said it would sit down at the table with the company - but at this stage it wasn't looking good.
"We've got other things we can do apart from strike action," he said. This could include not taking fares, and not turning on consoles which are used to store ticket and route information for AT.
Calls and emails to Howick & Eastern's office were not returned, and NZ Bus manager Shane McMahon declined to comment on the impact of yesterday's strike.
Yesterday morning, commuters reported the buses that were running were packed, as were trains.
Foot traffic was reportedly heavier than usual in some parts of the city.
On Dominion Rd, police were spotted stopping drivers in bus lanes - though a spokeswoman said bus lanes were not being specifically targeted by officers.
Last night, the impact on traffic was more significant. The Southern Motorway was severely congested between the city and Manukau - putting the travel time up to 88 minutes at one stage.
Congestion also affected the Northwestern and Southwestern motorways, but the New Zealand Transport Agency described the traffic as "heavy but generally normal for a Friday peak".