Mercedes chief Niki Lauda has given the green light for Lewis Hamilton and Nico Rosberg's title fight to turn to "warfare" if and when they have conclusively seen off all other championship pretenders.
Lauda says gloves can come off for Hamilton/Rosberg once rivals out of title
Ex-champion says his drivers "can drive over each other if they want to" once all other rivals eliminated from title fight
By James Galloway
