Depends on the state whether this was a legal driver or not. Some states have the violation exhibition of acceleration.
Having read through the MCL a few times, I have never seen that for Michigan. However, it is illegal to "coast" in Michigan. That's right, if you are going downhill, it is illegal to put your clutch in, or put the vehicle in neutral and let gravity or momentum do it's thing.
I drive a 6 speed, so I break the law every single day.
257.678 Coasting prohibited; violation as civil infraction.
Sec. 678.
(1) The driver of a motor vehicle when traveling upon a down grade shall not coast with the gears of the vehicle in neutral.
(2) The driver of a commercial motor vehicle when traveling upon a down grade shall not coast with the clutch disengaged.
(3) A person who violates this section is responsible for a civil infraction.
Taking off "too fast" is only covered under the following:
257.626a Drag races; prohibition on public highways; definition; prima facie evidence.
Sec. 626a.
It shall be unlawful for any person to operate any vehicle upon any highway, or any other place open to the general public, including any area designated for the parking of motor vehicles, within this state, in a speed or acceleration
http://www.legislature.mi.gov/(S(4h...ery=on&highlight=acceleration AND vehicle#topcontest or for the purpose of making a speed record, whether from a standing start or otherwise over a measured or unmeasured distance, or in a drag race as herein defined.
“Drag racing” means the operation of 2 or more vehicles from a point side by side at accelerating speeds in a competitive attempt to out-distance each other over a common selected course or where timing is involved or where timing devices are used in competitive accelerations of speeds by participating vehicles. Persons rendering assistance in any manner to such competitive use of vehicles shall be equally charged as participants. The operation of 2 or more vehicles either at speeds in excess of prima facie lawfully established speeds or rapidly accelerating from a common starting point to a speed in excess of such prima facie lawful speed is prima facie evidence of drag racing and is unlawful.