About 20 taxi drivers carried banners and blared loud music outside the head office of Yellow Cabs on Monday as the union started their job action.

About 800 drivers from the Yellow, Barrel, Checker and Prestige cab companies served strike notice last week. Some drivers walked off the job on Monday, but many were still picking up fares.

The drivers are angry with a fine they have to pay if they get in an accident on the job. The union says the fine can be as much as $6,200.

But the president of Yellow Cab, Phil Strong, says the surcharge is only paid by drivers who are found to be at fault in a collision. He says there have been far fewer collisions since it was put in place.

"It has resulted in everyone waking up and driving and reducing the at-fault accidents," he said.

Strong says the job action has had no impact on business so far.