A lone worker may only carry out operations or work which require him to be on the roof of the passenger compartment of a piece of equipment while it is in motion under the following cumulative conditions:
1° The equipment is fitted with an inspection control device designed and installed in such a way as to guarantee the safety of those involved;
2° The risk of falling is prevented :
a) As a matter of priority, by the design of the installation or by the implementation of collective protection measures;
b) Failing this, by the wearing of personal protective equipment preventing the worker from leaving the surface of the roof of the enclosure, provided that this protection is adapted to the nature of the risk, taking into account the technology of the equipment, the nature and duration of the work and the possibility of carrying it out under ergonomic conditions.