“We worried the driver may not have known about a mechanical problem so we signalled him to pull over at a service station,” said a police spokesman.

The police officers were shocked to see the driver was wet through and had been enjoying a shower via a sprinkler kettle system rigged up above his head.

His wife, who was sitting in the passenger’s seat, had been holding up a sheet of plastic to protect the instruments from the water.

She told police officers there were rushing to deliver goods in another city and she had rigged up the shower to keep her husband cool after the air-conditioning system broke down.

Police fined the driver and warned him he would be in serious trouble if he tried to have a shower at the wheel again.