The ACB had earlier this year submitted the report in response to a public interest litigation filed by a traffic constable alleging rampant corruption in the department.
The ACB report rubbished petitioner Sunil Toke's allegations and said it could not find out any corruption.
A division bench of justices R M Savant and Sadhana Jadhav said the ACB's probe report was implausible for they had themselves had unpleasant experiences on past occasions with the city traffic police.
The bench directed the Joint Commissioner of Mumbai traffic department to file an affidavit listing the steps taken to curb instances of traffic policemen demanding and accepting bribe from motorists.
The bench said most traffic constables were guilty of harassing motorists.
"We understand that the constables have long working hours, non-conducive work environment etc. But that cannot justify their harassment to motorists. They do not know how to talk to even women motorists," the bench said.
"Some mechanism must be evolved to check this. We are unsatisfied with this report," the court said posting the matter for further hearing after three weeks.
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