scenario 01 Participants: • • • Turnstile worker Policeman Vitalya Time: Not during the rush hour Unit 1 walks through frames. Vitalya considers Unit 1 suspicious and takes him to the X-ray to check his bag. To see what problems could come up during the shifts of operators and how they can be solved we performed a play-pretend session using Lego and a station mapped out on paper. We generated and illustrated a standard average subway station with multiple frames, narrow aisles and generally inconvenient layout. Conclusion Frames are left unattended.