The Toronto Transit Commission won't say what punishment a driver might face after allegedly driving a bus while intoxicated.

On March 12, passengers travelling on the Dawes Road bus complained about the driver, claiming the bus trip through the east end neighbourhood had been "erratic."

Police were called and the driver was given a breathalyzer. The driver blew somewhere between .05 and .08 — high enough to warrant a roadside three-day suspension of her licence.

"I'm not very pleased with the incident that occurred," said TTC general manager Gary Webster in an interview with CBC News.

The driver is suspended without pay while the incident is investigated.

Webster pointed to a new drug and alcohol policy that, he said, will go a long way to preventing such incidents in the future.

Although Webster said the TTC has a very strict policy against operating a vehicle under any sort of impairment, he would not say if the driver would be fired.

"That's an issue that we don't talk about publicly," he said.

TTC chairman Adam Giambrone said if the investigation concludes the driver was drunk, it would likely lead to termination from her job.

"We had some challenges with these sort of instances a year, year and a half ago. We started quite an aggressive campaign around work-safe, home-safe and drug testing and obviously we expect our workers to come to work fit for duty and we take this very seriously," he said.

The TTC has come under withering criticism in Toronto over the past few months: a debacle over the raising of transit fares that led to huge queues and delays for riders, a picture of a sleeping fare collector, major service disruptions on the subway lines and the sexual escapades of Giambrone, who was forced to give up his run for mayor.

In an attempt to improve its reputation, the TTC has appointed a panel to make suggestions on how to improve service and customer relations.