LAGTurbo lag. The time it takes a turbocharger to boost an engine's power from the moment the driver pushes the throttle.
LAPOne time around a track. Also used as a verb when a driver passes a car and is a full lap ahead of (or has lapped) that opponent. A driver "laps the field" by lapping every other car in the race.
LATE APEXTurning into a corner late and missing the optimum apex point in order to straighten out the last part of the corner. This allows the driver to accelerate earlier and harder, gaining maximum speed down the next straight.
LAUNCHA car can be propelled or launched into the air (all four wheels are off the ground) by hitting a severe bump or another car.
LEAD LAPThe race leader's lap. If the leader laps you for the first time, you are no longer on the lead lap.