A good way to tour the city is by open-top red bus.
The Sun (2010)
As the victorious Spain team paraded the trophy in an open-topbus through the centre of the capital, the city prepared for another long night of partying.
Times, Sunday Times (2010)
The free bus pass will cover all local services, including open-top tour buses, but will not be valid on most long-distance coaches.
Times, Sunday Times (2008)
Definition of 'bus'
bus
(bʌs)Explore 'bus' in the dictionary
countable noun [oft byNOUN]
A bus is a large motor vehicle which carries passengers from one place to another. Buses drive along particular routes, and you have to pay to travel in them.
Definition of 'open-top'
open-top
Explore 'open-top' in the dictionary
adjective [ADJECTIVE noun]
An open-top bus has no roof, so that the people sitting on the top level can see or be seen more easily. An open-top car has no roof or has a roof that can be removed.