Regiotram Utrecht (RU) as owner of the network supervises and inspects whether contractors during execution of their works uphold the safety terms and conditions (Regiotram Utrecht house rules and safety procedures). During the works supervisors from Regiotram Utrecht may make inspections. If the supervisor observes breaches, the supervisor can restrict your access to the work site.

Safety critical breaches and breaches of the house rules immediately result in banning from the work site of individuals responsible for such breaches. Multiple penalties can be imposed at the same time. A yellow and red card system is used.

An individual yellow card lapses after 6 months, provided it can be shown that retraining has been carried out. Individual red cards lapse after 9 months or more again provided appropriate retraining has been given.