At the risk of explaining what everyone here already gets: I like how the bottom picture could literally be a diagram of a 4-way deadlock where the buses are threads of execution and the roundabout exits are object locks.
Whereas in top picture there are no passengers and I’m fairly sure the buses aren’t moving. Which probably says something about the state of the documentation
Am I weird for actually wanting to use this out of nostalgia? I distinctly remember thinking at the time that the gradients on the window bars were the coolest thing ever, especially because you could configure them to be whatever wacky colours you wanted.