Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. MAN 24.310 (also coded as A57 or A59) is a low-floor double-decker bus model built for the Hong Kong market. Unlike other low-floor double-decker buses in Hong Kong, there are steps in the lower deck aisle after the rear exit. For the type code 24.310, 24 means that the bus has the maximum gross weight of 24 tonnes, whilst 310 means that the maximum power of the engine is 310 hp (231 kW). In 1998, Citybus ordered a number of MAN 24.310 buses with Berkhof/Volgren bodywork after the trial of an Australian-built MAN 24.350. However in early 1999, Transport Department of Hong Kong set quota on the number of buses owned by Citybus, and therefore the order was cancelled involuntarily. At that time, construction of 32 Berkhof-bodied buses and 2 Volgren-bodied buses had been completed, so MAN had to find buyers for these buses. Finally, one Berkhof- bodied bus was retained by MAN for testing, and the others were sold for operations in Hong Kong.