well, there's this.

Regulations

116 The Minister may make regulations

(a) governing any matter with respect to

(i) the loading of and the transporting of goods on vehicles,

(ii) the towing of vehicles, and

(iii) the transporting of passengers by vehicles



You'll find the Traffic Safety Act here.

http://www.qp.gov.ab.ca/documents/acts/T06.cfm