I saw this sentence on the web. Wondering what does "lights-to-flag" mean? I got this sentence from a Car Racing website.
... his remarkable pace back through the field was arguably just as telling and definitely far more thrilling than any of the lights-to-flag showcases he has become renowned for.
I'm not a racing fan, but I do know that the race ends with a black and white checkered flag waving to show someone has won - so the flag is the symbol for ending.
I think (though perhaps a NASCAR fan will wander by) that a race starts with a stack of lighs that light in sequence and when the green lights at the bottom of the stack light, the racers can start. So that would make th