WHILE PUTTING PERMIT STAKES IN ARE 3E FOR FINALY PERMIT RELEASE, DRIVER SAW FLAMES IN HIS REAR VIEW MIRROR. DRIVER GOT AWAY FROM FIRE AND CONTACT FIRE BRIGADE PERSONNEL. THE GRASS WAS SET BY H EAT FROM THE CADILITIC CONVERTOR ON THE PICK UP TRUCK. THE PICK UP TRUCK WAS A 1999 F250 FORD TRUCK, AND THE FIRE BURNED APPROX. 40 ACRES.