National Express Dundee managing director Phil Smith crashed a bus while helping out during staff shortages.
He is understood to have struck a car while behind the wheel of a bus in the city centre.
Mr Smith took the step of driving a service bus after a company dispute that led to drivers refusing to work overtime shifts.
Drivers have been unhappy about a number of suspensions and sackings, and what they regard as excessive overtime.
In total, close to 400 services were affected during the dispute.
Mr Smith had been out driving buses to cover the shortages on each of the four days, along with other senior members of staff.
A source at National Express said the incident was the talk of the depot.
He added: “He was driving to cover for the staff shortages and he hit the side of a car.
“I think it’s good he went out on the road because it lets him see what we face every day, instead of just sitting in an office.”
Mr Smith said: “All company procedures have been observed. It was a non-injury accident.”
Discussions have been continuing between union shop stewards, drivers and National Express Dundee bosses since the problems saw commuters left standing at bus stops all over the city.
Services are now returning to normal but discussions with the union are continuing.