Depends where he is at, for example:
http://www.gov.ns.ca/agri/farmsafety/standards/tractor.shtml
The Occupational Safety General Regulations (Part 7) require that all tractors manufactured on or after January 1, 1974 be equipped with a rollover protective structure (ROPS) that meets minimum CSA standards. Tractors manufactured before January 1, 1974 should, where reasonably practicable, be equipped with a ROPS that meets requirements set out in Regulations for older tractors.
Here is the legal wording in Nova Scotia.
http://www.gov.ns.ca/just/regulations/regs/ohsgensf.htm
Rollover protection
63 (1) An employer shall ensure that, where reasonably practicable, powered mobile equipment and industrial lift trucks manufactured on or after January 1, 1974, are equipped with rollover protective structures that meet the minimum safety requirements of the following standards:
(a) CSA standard B352.0-95, "Rollover Protective Structures (ROPS) for Agricultural, Construction, Earthmoving, Forestry, Industrial and Mining Machines - Part 1: General Requirements", or is certified by an engineer or the manufacturer to provide equivalent or better protection;
(b) where applicable, CSA standard B352.1-95 (R1999), "Rollover Protective Structures (ROPS) for Agricultural, Construction, Earthmoving, Forestry, Industrial, and Mining Machines - Part 2: Testing Requirements for ROPS on Agricultural Tractors", or is certified by an engineer or the manufacturer to provide equivalent or better protection; and
(c) where applicable, CSA standard B352.2-95 (R1999), "Rollover Protective Structures (ROPS) for Agricultural, Construction, Earthmoving, Forestry, Industrial, and Mining Machines - Part 3: Testing Requirements for ROPS on Construction, Earthmoving, Forestry, Industrial, and Mining Machines", or is certified by an engineer or the manufacturer to provide equivalent or better protection.
Subsection 63(1) replaced: O.I.C. 2000-130, N.S. Reg. 52/2000.