A NSW South Coast driver has received a slippery surprise, after a red-bellied black snake scaled his window while he was driving near Eden.

Ted Ogier was running a delivery for his employer when the snake slithered out from the bonnet.

From there, the venomous reptile wrapped itself around the driver's side mirror, as the car continued along the road, reports the ABC News.

‘It'd come out from under the engine bay under the bonnet, it was probably a bit warm there,’ Ogier said.

Ogier called his co-worker Kai Pearse, who came equipped with a broom to remove the snake.

‘I just had a broom in the back of the ute and … basically just got him off the car nice and safely, and just ushered him into the bushland off on the side of the road,’ Pearse said.

The pair estimated the snake was 2.5-metres long, and Pearse theorised the snake had entered the engine bay seeking warmth.

‘Last night it got a bit cold down here on the South Coast, so I think he's got up into the engine bay of the vehicle, and he sat up on the engine to keep himself warm,’ he said.

‘Then this morning Ted's taken that vehicle down to Eden and it might've got a bit too hot in there, so he wanted out.’

Despite the experience, Ogier said there were worse critters to encounter on the road.

‘Not as frightening as getting a spider on the inside — spiders are one thing I don't like, but I don't like snakes either,’ he said.