Former WA treasurer Troy Buswell has been fined and disqualified from driving over a series of car crashes that left a trail of destruction near his Subiaco home and led to his resignation from Cabinet.

Buswell pleaded guilty to 11 offences committed when he was driving his ministerial car home from a wedding in the early hours of February 23.

He was fined $3,100 and disqualified from driving for 12 months.

However, because none of the offences carry a jail term, he cannot be disqualified from Parliament.

Buswell, who did not attend the Perth Magistrates Court hearing, entered pleas of guilty in writing to four charges of failing to report an accident, three charges of failing to stop after an accident and four charges of careless driving.

He was not represented by a lawyer.

In a statement, Buswell said: "I offer no excuses for my actions, apologise to those upon whom I have impacted and accept fully the consequences."

The court was told that Buswell crashed into four parked cars, causing more than $12,000 worth of damage.

The court also heard he drove up a kerb at a roundabout before smashing into a car, pushing it into another vehicle.

No explanation for actions offered

Buswell did not provide police with an explanation for his manner of driving, the prosecutor said.

The court heard Buswell did not have a traffic record.

Chief magistrate Steven Heath said Buswell was entitled to a 25 per cent discount on his fine for his early guilty pleas.

He fined the former treasurer $500 for each of the three charges of failing to stop, $200 for each of the four charges of failing to report an accident and $200 for each of the four careless driving charges.

After the night in question Buswell had what has been described as a breakdown and resigned from cabinet.

However, details of his driving offences did not emerge until weeks later.

Opposition Leader Mark McGowan said today that Buswell should have been sacked when the offences came to light, and his actions were a new low for the Government.

"His failure to cooperate with police, his failure to answer questions, his failure to give a statement to the police is appalling and clearly unacceptable," Mr McGowan said.

"That's the sort of stuff that drug dealers and bikies do. Not ministers and not members of Parliament."

Buswell, the member for Vasse, has been on leave but is due back in Parliament next week.