The works take place outside the danger zone or are so short and easy to interrupt, that they can be executed during tram service and where necessary executed between tram movements under the 15-seconds rule.

The safety instructions are given before the works by a “lookout-tram” or by the employer in case of works carried out as "individual working alone".

Terms for starting works under regime A are:
- Work permit issued
- Entry license obtained
- Use of LRI-drawings in combination with 15-seconds rule
- Log on and off at tram traffic control
- When working with more than 2 persons, escorted by “lookout-tram”