188(1)An employer shall ensure that an excavation or trench is adequately illuminated
(a)
when work is being carried out in or near the excavation or trench, and
(b)
by warning lights or reflective materials to prevent inadvertent entry.
Barrier to protect workers
188(2)An employer shall ensure that an adequate barrier is set up around the excavation or trench so as to protect employees working in the excavation or trench from vehicular traffic.