Marco Andretti has turned the final lap in a motor racing career that spanned three decades.

Back in 2008, I brought my radar gun to Petit Le Mans and captured trap speeds at three corners to document the unbelievable performance capabilities of the American Le Mans Series LMP1 and LMP2 prototypes, along with the GT1 and GT2 cars of the day.With the help of a few...

The American Le Mans Series put on a stellar show 10 years ago at Detroit's Belle Isle, and at the conclusion of the 2h45m race, a twist turned the final outcome on its head.With its four classes in motion, the ALMS saw Audi Sport's No. 1 R10 TDI LMP1 machine...