During the four days of the Monaco Grand Prix: Thursday's Practice session, Qualifying on Saturday and of course the Grand Prix itself on Sunday - if you live anywhere with access to the track then you need a pass to enter your apartment building.
Perhaps you are a visitor and will be watching the race from a balcony overlooking the track, well you need one of these passes else you won't get onto that balcony. Every apartment building around the track is locked down and bolted and you'd better believe it. You would normally enter from the rear and give your name and hand over your pass before you are allowed in. Your name must match that on the official list. The pass shows not just the name of the building but also the name of the owner of the particular apartment you are visiting and that person's phone number. In this case, it's the Palais Heracles on the Port of Monaco. (I've masked the name and telephone number)
Trains and buses are the only sensible ways to get into Monaco on race days. Today the track will be closed from 07.00h to 18.30h and in Monaco, when the Grand Prix track is closed, Monaco is closed.
Lucky me has a friend whose mother lives on the 11th floor of the Palais Heracles which is bang over the Start/Finish line of the Grand Prix track - in front of Port Hercule - and today I'm invited onto the balcony for lunch and to take photographs. Come back tomorrow and see if I got a shot of Jensen Button. Don't count on it - I think he might be going too fast!