"Aside from the fact none of the teenagers in the car were old enough to even be learning to drive, people of this age simply don't have the skills required to make the correct decisions required on the roads," Mr Simpson said.
The speed limit where the car was pulled over is 50km/h.
Mr Simpson said the incident was made worse by the fact the car had been taken without the grandmother's approval.
"Our message to teenagers is that the graduated driver licence system is there for a reason; for young people of the right age to ease themselves into the challenges of driving."
Mr Simpson said thankfully it was not bad news police were delivering to the grandmother when they knocked on her door that night, but rather some "sheepish grandchildren".