can only mean that now both cars are no longer in motion because according to box f 2 the stopping brakes are triggered and according to answer no n to question q 2 only one elevator car a 1 or a 2 is in motion according to box f 4 no further braking by use of car brakes is then required since obviously the braking action of the stopping brake has sufficed if question q 4 is answered by no n then question q 2 is posed again if question q 2 is answered by yes j thus both elevator cars a 1 and a 2 are in motion then subsequently question q 5 is posed it is clarified by question q 5 whether u201c di u201d is the same as or even smaller than s stop min ii if question q 5 is answered by no n then question q 4 is posed for further clarification i e it is clarified by question q 4 whether the relative speed vi rel of the elevator cars a 1 a 2 may be zero if this is the case then according to box f 4 no additional braking by car brakes is necessary if thereagainst question q 5 is answered by yes j then according to box f 3 an additional braking by the car brakes for an emergency stop.