Driverless mini buses could hit the roads in HDB estates within the next five years to supplement Singapore's public transport system. In his first interview with the media since taking on his new role, Acting Transport Minister Jeffrey Siow said a key focus will be to make public transport as competitive, if not better, than private options. He stressed that transport is a long-term effort, with projects stretching up to 15 years. Richa Mathew reports.