Question about NJ License Renewal

[stangzroastrice]

Hey guys, just got my NJ license renewed for the first time today and noticed something strange upon coming home. There is a Restriction 3 endorsed on the license, which stands for 'mechanical device'. I looked through NJ driving manuals online and tried to search for it as to what it specifically pertains to, but could not find any details on it. Could anyone with some incite shed some light on what the hell that means?

This is what I pulled out of the NJ 2009 Driver's Manual:
restrictions
If a motorist has a restriction on his/her license (such as the need to wear corrective
lenses while driving), it will appear on the license in a coded form.
Restrictions are as follows:
• 1- Corrective lenses required
• 2- Prosthetic device
• 3- Mechanical device
• 4- Hearing impaired
• 5- Attached restrictions1
1 This category applies to special modifications to an applicant’s vehicle or
limited driver privileges for a medical condition. The card detailing the
attached restrictions must remain with the driver license.

[Sarge]

Im checking this out nobody around here could give me a clear answer. I would guess that this is when the vehicle is is modifed for say a little person, so they can drive the vehicle.

[stangzroastrice]

I was thinking along these lines as well yet I don't have any physical or mental disabilities, so it must of been a mistake if that is what it really stands for. If you happen to find anything else, that would be great, otherwise, thanks for the help either way.