reckless driving, unsafe operation of a motor vehicle, unsafe lane change, idk.
technically speeding is going faster than it is safe to travel, or going faster than the posted limit. cops call. traffic can be moving, just depends on their speed and your speed, and how many cars are around you, and if the cop wants to be a dick. you can split between the fast lane and the carpool goin about 80 and not get stopped if traffic is moving along around 65-70.
i mostly do it at stop lights/stop signs, or when ppl are driving really slow, or when its safer to be in front of the pack-i dont like to be surrounded by cars on all sides if i can help it.