[Slice]

g_SpeedThreshold is just (SPEED_THRESHOLD ^ 2), so you shouldn't modify that. The only things you should change are SPEED_MULTIPLIER and SPEED_THRESHOLD.

SPEED_MULTIPLIER is the one that changes how much faster vehicles will travel, and SPEED_THRESHOLD just defines when it should start increasing the speed.

For example, you could set SPEED_THRESHOLD to 1.0 and the speed would increase only when you've been going fast for a while.