(no subject)

[upthera44.livejournal.com]

I often want to ask questions regarding bus routes in Russia, but never know how to say it properly. It seems that people say "Пятнадцатый автобус ИДЁТ куда-то?" when asking where a bus goes in general. Is this right? I would expect "Пятнадцатый автобус ХОДИТ куда-то?" since we're speaking generally and not about a specific bus going to a specific place right now, but then again if it were strictly logical I would expect ездить / ехать  and not идти / ходить. Can someone explain this a bit?

Also what about these phrases: 

"Did the Xth bus already come?" 
"Do you know if Xth bus comes here?"
"Will the Xth bus come soon?"

Thanks