What are the advantages and disadvantages of bendy buses with respect to double-decker buses for a transportation system? When you travel around in Singapore you will come across plenty of bendy buses as well as double-deckers. Both these form an integral part of the transport system in the country and both have its sets of advantages and disadvantages. Boarding and disembarking at the bus terminals is easier when it comes to bendy buses. This is because of the extra doors available in this type of bus. When you consider the double-deckers, you will have to first wait for people to disembark and then hop in because the absence of too many door.