There is usually a very small notice advising use of button in the DP but in reality it is rarely used as most appear to.use their arms to stop doors closing.
yes
website link for cable car
https://ulriken643.no/en/webcam
""Tickets for the Ulriksbussen are bought at the bus stop; Torgalmenningen 1A. Departure from the city center approximately every 30 minutes every day between 09:00 and 18:30."