Just wanna add that UrbEx can be wild, but loudspeaker warnings? That's the next level. I've heard of places upping their security game, but that's some intense stuff.
Are such loudspeaker warnings live - or automated recorded responses? In the Hitchhiker's Guide to the Galaxy, as Ford Prefect and company near the planet of Magrathea, their approach triggers an automated recorded message, from the Commercial Council of Magrathea, that notes that Magrathea is currently closed for business, and to leave. A follow-up message announces that nuclear missiles will be launched against the ship.
The missiles are detected, and the crew struggle to get the
Heart of Gold to escape the missiles. Disaster is averted when Arthur activates the Infinite Improbability Drive and the missiles are turned into a bowl of petunias and a very surprised-looking sperm whale.
I doubt if the German secca mob have nuclear missiles, but you never know. And they would really make the place derelict.