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Whatever speed they're allowed by the driver of the vehicle.
The current F1 champion (2010) is Sebastien Vettel. He is almost certainly going to be the 2011 champion aswell.
Sebastian Vettel
doing pretty crappy this year for a world champion. he's a good driver but not a great driver.
The rocks try to overcome the force of gravity pulling the bus downhill. By placing the rocks under the wheels, the driver creates friction between the rocks and the ground, helping to prevent the bus from rolling further downhill.
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Driver use gear 'L' or '2' when driving uphill or downhill which required higher gear ratio to move the uphill. Downhill wise, driver use '2' or 'L' for safety purpose. The low gear ratio will use the high gear ratio to slow down the speed of driving downhill and creating 'pulling' force on your car to safety purposes. Gear '2' can be use for overtaking on the highway too provided at the appropriate speed.
In the Nascar Nationwide Series, the driver with the most points accumulated after 33 races, is declared the champion.
Fernando Alonso
Robert Michael Champion - the Baseball player - was born September 24, 1955. Mike O. Champion - the Basketball player - was born April 5, 1964. Mike Champion - the Racing Driver - (unknown). Michael Champion - the Actor - (unknown).
Lewis Hamilton is a formula one world champion and driver. He won the championship in 2008. He is a British driver.
The defending Formula One World Champion heading into the 2012 season is Sebastien Vettel of the Red Bull Racingchassis.