A 15-year-old girl was left stranded 50 miles from her Fife home after the bus she was travelling on broke down.
Rosie Randall was returning from her drama school in Glasgow when there was a smell of burning rubber and she was asked to evacuate the bus on to the M80.
After 40 minutes on the hard shoulder a replacement bus took her to Cumbernauld where she was left on Saturday evening.
A Stagecoach East Scotland spokeswoman apologised.
The company said it has launched a full internal review into the incident.
The 15-year-old’s father, Phil Randall, 46, said he was left “angry and bewildered”.
The firefighter training officer said he was extremely worried when his “very upset” daughter called him to tell him what had happened.
It took him an hour-and-a-half to drive to Cumbernauld to collect her.
He said: “I normally pick her up but her mother had been in hospital so she made the unusual trip of coming home on the bus by herself.
“I don’t want an apology, I want assurances that something is put in place so that this never happens again.”
A spokeswoman for Stagecoach East Scotland said: “We will proceed with a full internal review to improve (our) procedures.”
