The Traffic Commissioner for Wales, Nick Jones, has issued a formal warning to Stagecoach in South Wales after a Public Inquiry.
Mr Jones received reports that the service on two bus routes (Cardiff to Graig y Rhacca and Cardiff to Senghenydd) was “wholly inadequate”.
However, he noted that successive monitoring of the routes had resulted in a clear improvement.
In a written decision issued after two hearings, Mr Jones says: “I am satisfied that this is an operator that has sought to address the problems identified, some of which were relatively unusual.
“I remind myself that the operator has had a large number of registered services in the area, most are not to my knowledge the cause of any significant complaint.”