A Travel West Midlands bus driver was sacked after a passenger claimed to have seen him defecating near his vehicle outside a supermarket, an employment tribunal has heard.
Pargat Singh, who is claiming unfair dismissal against TWM, is said to have committed the act in full view of the public in Coventry last October.
Giving evidence at the tribunal in Birmingham, the company's staff performance manager, Jyoti Kapoor, said Singh, 63, was deemed to be guilty of gross misconduct despite his insistence that he had left his vehicle to urinate.
Mrs Kapoor told the hearing that a customer had claimed that the driver had committed an act of gross indecency on October 3 last year near a Tesco store close to Coventry's Ricoh Arena.
The informant, who refused to leave her contact details and would only give her first name, alleged that Singh, 63, had climbed over a picket fence and defecated on a grass verge.
He then wiped his hands on the bars of the fence before returning to his vehicle, it was claimed.
Commenting on the disciplinary process which led to Singh's dismissal, Mrs Kapoor said: "The complainant also said that when she spoke to driver Singh... he was abusive to her.
"I considered that the passenger complaint was credible. He [Singh] accepted that the passenger had challenged him about washing his hands when he returned to the vehicle.
"Had driver Singh said the passenger was wrong or that she was lying then my approach would have been different."
Mrs Kapoor said Mr Singh would have been guilty of gross misconduct even if his employer had believed his account of the events.
"I considered that it would have been reasonable for driver Singh to have used the Tesco toilets, which were very close," Mrs Kapoor told the tribunal panel.
Singh, a Sikh who wears a turban, claims the complaint against him was motivated by racism and denies that he defecated at the time of the incident.
The claimant, a diabetic who is from Coventry, is being backed by the Unite trade union.
He claims he hid behind a wall when he went to urinate and did not know he was being observed.