Imagine you are at the bus stop. You see a bus coming, but you can't read the number, so you ask: "What number bus is that?"

However, usually the noun used as a determiner precedes the main noun, for example: house number, ticket number, seat number, phone number, etc. So why, in this case, don't you say "what bus number is that?"

By the way, my English teacher told me the right way to say this is, "What number bus is that?"

  • @J.R. - I don't know about OP but if you translate the Hindi version of the said text into English literally (in the same sequence of words), it would come to "What number bus is that?"
    – Mohit
    Feb 18, 2013 at 11:24
  • I will consider "route number of the bus" (or "bus route number"), but I am not a native English speaker.
    – Alvin Wong
    Feb 18, 2013 at 15:31
  • 1
    @Alvin: certainly better than "bus number" but a different shade of meaning. The 11 bus route (or conceivably bus route 11) goes from the Town Hall to the University, and has three buses assigned to it today. Feb 18, 2013 at 16:09
  • @AlvinWong I'd omit "number" entirely. I don't care about the bus's unique identifier; I care that it's going to go the route I want to take. "Which route is that [bus]?". Or, because no one cares about the bus's unique identifier when they're waiting for the bus, "Which bus is that?" also implies route number. I have no idea why anyone is considering the bus's unique identification number as a possible answer...
    – Izkata
    Feb 18, 2013 at 19:06
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    Is this a British English thing? "What number bus...?" sounds wierd to me (I'm used to American English). I'd probably say "What bus number...?" (if not just "What bus..."). I'd only consider the "What xxx bus" form in "what kind of bus" or maybe "what number of bus", "what color of bus".
    – jdm
    Feb 18, 2013 at 23:52

6 Answers 6


Consider What colour bus is that? against What bus colour is that? The former would be answered "It's a green one [which means it belongs to Green Bus Company, and is not the one you want]" because the noun is bus and colour is an adjective of sorts. What bus colour is that? would have to be answered "Shade A75 Soothing Green" (though I'm having difficulty imagining a situation where anybody cared) because the noun is colour and bus is an attributive adjective. It is exactly the same with number; that is a number 11 bus, but its bus number is on a little chassis plate for the mechanics' benefit.

  • Furthermore, What bus colour is that? or "what bus number is that?" would more like be a rhetorical question eliciting a snigger or a guffaw -- "Is that colour what a bus is supposed to sport? No."
    – Kris
    Feb 18, 2013 at 13:59

If we speak of a number 3 bus or a number 8 bus, then it follows that we ask ‘What number bus is that?’

  • But don't you say "this is bus number 8"? Not "this is number 8 bus"?
    – HQQ
    Feb 18, 2013 at 11:16
  • 2
    No. I say "this is A number 8 bus" because if I miss it there will be another number 8 bus along later.
    – Fortiter
    Feb 18, 2013 at 11:18
  • 1
    Barrie, how about "What number is that bus?"
    – user19148
    Feb 18, 2013 at 11:27
  • 4
    Where I live it's a number 8 bus. The number refers to the route. What number is that bus? might be an inquiry about its registration number. Feb 18, 2013 at 11:47
  • Or is the first, second or third bus in a row of buses
    – mplungjan
    Feb 18, 2013 at 12:54

A house number, ticket number, seat number or phone number is a fixed property of the entity to which it is attached. In the same sense a bus will have a bus number (identifying its unique combination of chassis and body).

If I am looking down the road at an approaching bus, I am usually not interested in the mechanical details of the vehicle. The information I want is the path it will follow as indicated by the route number which is temporarily displayed on this bus.

When I ask "which number bus" is coming, I mean what is the route number of this bus. That is quite different from its bus number.


Actual mini-conversation I've had at bus stops:

"Which bus is that?"
"It's the 22. And a 36 behind it." (for bus route 22 and 36)

You're waiting for a bus route, not a specific bus on the route (usually). No one is going to think you want a bus's unique identifier - generally, no one except drivers and mechanics care about that.

Alternatively, if you want to specify what type of number, I'd ask:

"Which bus route is that?"


Both versions are perfectly natural English, but in fact the "superficially less grammatical" form what number bus is several times more popular than what bus number.

I imagine the reason for this is that in the context of asking the question, number is a far more important word than bus, so you want to attach it more closely to the "question" indicator what.


You could say "what bus number is that?", but you normally don't really care what the number is, what you really care is what bus it is, (if I plan to take the number 15, I have no interest in 15 being on a bus, other than the fact that a bus with 15 on it, is a number 15 bus, and will follow the number 15 bus route). The number is just a way to inform you of that, so "what number bus is that?" asks directly about what you most care about.

Both amount to the same thing, in ultimate information if not in how it is enquired about, and both are valid.

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