Nano overtaking porsche and BMW

A Nano breaks down on a roadside.

A BMW 750 stops to help the driver.
"I will tow you to the next service station, but if I drive too fast please flash your lights"

They start up slowly but a only a km or so down the line a Porsche speeds past 150km an hour.

The BMW driver forgets about the nano & guns it after the Porsche.

Just as all 3 of them tear through a speed trap the cop radios the HQ:
"You won't believe I have seen a BMW & a Porsche racing past 170 km an hour with a Nano behind them flashing its lights to Overtake"