Steven and Ines are on their honeymoon in Paris at the moment. I am on my way. I am on the bus. The dentistís is on the second floor. I live in the west of Germany. Who is that woman standing at the bus stop? I think that I have seen her before.
Some more examples:
at home at work at school at university at college at the top at the bottom at the side at reception
in a car in a taxi in a helicopter in a boat in a lift (elevator) in the newspaper in the sky in a row in Oxford Street
on a bus on a train on a plane on a ship on a bicycle, on a motorbike on a horse, on an elephant on the radio, on television on the left, on the right on the way