MotoGP returns to action this weekend, hosted by the iconic Indianapolis Motor Speedway as one of the two US-based races in this season. Hiroshi Yamada, manager of Bridgestone's Motorsport Department,said: "It is always a pleasure to visit Indianapolis - the motorsport culture there is very strong and the whole city gets behind the GP." "The venue itself is unique with elements of three different eras incorporated and it is a challenge for both riders and tyres. Perhaps due to its particular layout, Indy is a race where the result is always hard to predict."UNIQUE EXPERIENCEThe circuit has been home to many unpredictable finishes; four different winners and seven different riders have reached the podium since the race was added to the calendar four years earlier.Jorge Lorenzo won the race in 2009 sporting his customised Captain America helmet and in 2010 American Ben Spies had a strong performance in front of this home crowd, taking pole position. Indianapolis has 257 000 permanent seats, making it the largest spectator sporting facility in the world. It was originally constructed in 1909 with a four-kilometre oval; the 16-turn motorcycle road circuit includes part of the historic oval and was purpose-built for MotoGP.The circuit was resurfaced in 2011 year to improve grip for riders and some undulations on the tarmac were removed.