The affordability, usability and efficiency of Bangkok’s mass-transit system leaves much to be desired. As to affordability, the system — comprising BTS elevated and MRT underground trains, is not necessarily for the masses. It’s primarily a transport mode for middle-class earners who can afford the hefty ticket prices. Indeed, a commuter can easily spend at least 100 baht on a round trip, almost a third of the daily wage for labourers, shop workers and so forth. When it comes to usability and efficiency, other cities’ transport systems have tapped into digital innovations such as mobile-app t…