This is what the B.C. Off-Road Vehicle Act says....
Regulations — general
30 (1) The Lieutenant Governor in Council may make regulations referred to in section 41 of the Interpretation Act.
(2) Without limiting subsection (1), the Lieutenant Governor in Council may make regulations as follows:
(g) respecting number plates, decals and stickers issued under this Act, including, without limitation, the replacement, transfer and manner of display of the number plates, decals and stickers;
Section 41 of the Interpretation Act.
Powers to make regulations
41 (1) If an enactment provides that the Lieutenant Governor in Council or any other person may make regulations, the enactment must be construed as empowering the Lieutenant Governor in Council or that other person, for the purpose of carrying out the enactment according to its intent, to
(a) make regulations as are considered necessary and advisable, are ancillary to it, and are not inconsistent with it,
(b) provide for administrative and procedural matters for which no express, or only partial, provision has been made,
(c) limit the application of a regulation in time or place or both,
(d) prescribe the amount of a fee authorized by the enactment,
(e) provide, for a regulation made by or with the approval of the Lieutenant Governor in Council, that its contravention constitutes an offence, and
(f) provide that a person who is guilty of an offence created under paragraph (e) is liable to a penalty not greater than the penalties provided in the Offence Act.
(2) A regulation made under the authority of an enactment has the force of law.
So I'm not a lawyer, but to me it seems like there are no actual regs, but they withhold the right to make one up if they want.