Bristol is fast -- how fast can it be?

BRISTOL, Tenn. — For many years, the idea of NASCAR drivers running a lap faster than 15 seconds on the half-mile surface at Bristol Motor Speedway was considered to be something of a fantasy.Steadily, tires changed, engines got stronger, drivers got bolder, Bristol‘s “best” groove got better. Fifteen seconds eventually became something more than a concept. Carl Edwards ran a lap in 14.989 seconds to win the pole for the Bristol spring race in 2011. He was the only driver