Employers should take particular care in the timing of safety-critical tasks in shift cycles and during individual shifts.
7.2 These should, to the greatest extent possible, not be undertaken at a time when the employees involved may be fatigued or have low levels of alertness.
7.3 This is of particular importance to employers, such as operators of major hazard installations whose activities have a direct impact upon the public, and operators of services such as mass transportation or goods transportation.