New Delhi, Oct 22: Current Formula 1 driver's champion Sebastian Vettel believes that the Buddh International Circuit (BIC) is one of the most challenging circuits in the world.
"The BIC really has emerged as one of the most challenging circuits on the calendar for the drivers.
"I loved the track layout last year, but not just because I won the race. With an average speed of 235 km/h, the course is the second quickest of the year after Monza," said Vettel, who hails from Germany, on the official F1 website.
"There is a lot of elevation change around the lap which adds to the fun, from as much as eight percent downhill and up to 10 percent uphill; it's like a roller coaster."