Works where the entire tram track is out of service. All trams are behind a fence on the tram premises.
During the works no rail vehicles are present on the track, or there are only work activities within the rail vehicles with all personnel within the rail vehicle. Isolating (part of) the electrical system is possible.

Terms for starting works under Regime D are:
- Work permit issued
- Entry license obtained
- Log on and off at tram traffic control by engineering supervisor (or controller of site safety when working under electrical system isolation)