Gordon Parratt, 69, felt the 85-centimetre (33-inch) long snake wind itself around his leg while he was driving.
At first he thought an insect had brushed his leg and swiped it away, but when he looked down he saw the snake next to his left foot, the report said. "Fortunately I'm not the panicky type. My wife immediately put her feet up on the dashboard," said Parratt.
The Pretoria couple made several stops to remove the snake but could not find it, until it wrapped itself around Parratt's leg. "Its head came up to my knee," he said.
Finally the couple managed to call a snake expert to remove the cobra, the report said.