"Likely to be useful to a person committing or preparing an act of terrorism"
Read it carefully.
It doesn't say "Information obtained in preparation for or commission of an act of terrorism."
Timetables and maps are mentioned by others above, quite rightly, and that means that just about everyone is guilty.
Which is very convenient if you want to implement a police state.
What next? Night and Fog? I'm not joking here people, though I wish to god I was.