Firefighters were called to the blaze on the Toneway at 4.15pm yesterday (Friday).
Two fire crews attended the incident on the A358 which resulted in severe damage to the car and damage to the road.
A Devon and Somerset Fire and Rescue Service spokesman said the vehicle was well alight by the time it was tackled by firefighters.
He added: “The vehicle and highway sustained damage, and the cause of the fire was deemed accidental ignition. Duty of care was left with the police.”