[jobigoud]

I think another confusing factor about that specific example is that bus shouldn't ever start before their schedule. Otherwise you run the risk of a bunch of people missing their bus even though they showed up on time. I think bus, trains and planes can only be late.

For example this is an article about a Japanese Train company issuing a public apology for departing 20 seconds early. https://www.bbc.com/news/world-asia-42009839