MotoGP World Champions Valentino Rossi and Jorge Lorenzo have both criticised the grip levels at Indianpolis with the Spaniard calling for the track to be re-surfaced.

Casey Stoner, Nicky Hayden and Ben Spies all crashed within a hundred yards of each other during today's qualifying session, necessitating a trip to hospital for each of them, while Rossi also had a big moment in the same place.

The Italian said there is a lack of grip at the American track while Lorenzo went one step further and said the place needs a whole new set of tarmac. Neither called into question Bridgestone's choice of tyres for the race, with Rossi saying softer compunds simply wouldn't last to the end of a race on the abrasive tarmac.

"This is the worst tarmac on any track in the championship and I would like to work to change the tarmac. The first sector it is working well but in the other parts it is no good. It is very white, very slippery, there are a lot of bump so I would like a different tarmac," said Lorenzo this afternoon.

Rossi added: "For me, the problem is this track don't have a good grip. The light asphalt is very slippery but at the same time Bridgestone bring a very hard tyre on the edge and for this reason we see very bad crash.

"The surface create a very high temperature in the tyre but with a normal tyre it is more safe but difficult to arrive at the end of the race."