A vehicle fire has caused delays on a road in Devon, with reports of the incident involving different types of vehicles, including a car and a lorry, on various roads, including the M5 and A30. The cause of the fire has been confirmed as accidental in one instance, but the circumstances of other reported incidents are unclear. The fires have resulted in road closures, including a partial closure of the A30 and a section of the M5, impacting travelers.