The Transmission is the over riding factor. In Drive or Reverse the warning beeper is off. If you put the Bus in Neutral and turn off the key without the parking brake engaged the warning device goes crazy. It knows you are about to leave the Bus in neutral, unattended with the key off. A nice safety precaution. Now, how I can get it up on Stands without the brake applied so I can rotate the wheels like Jon is the unknown.