Younger drivers used to driving a new car every year might find it easier to adapt to the new F1 cars, which Mercedes' Kimi Antonelli says will require drivers to be "two steps ahead of the others".

NASCAR evaluated six different rule change options in a test at Michigan Speedway on Monday as it investigates ways to improve the quality of Sprint Cup racing for 2015.Ten drivers from nine different teams took part in the test, which included two short mock races.NASCAR's vice president of innovation and...