A customer uses the GrabTaxi app on her smartphone to book for a taxi in Hanoi

A customer uses the GrabTaxi app on her smartphone to book for a taxi in Hanoi

A customer uses the GrabTaxi app on her smartphone to book for a taxi in Hanoi, Vietnam September 9, 2015. A young, tech-savvy population short on cars have taken off among Vietnam's rapidly expanding middle class as they provide four-wheeled comfort in a country better known for chaotic swarms of scooters and Southeast Asia's most expensive taxi fares. Picture taken September 9, 2015. REUTERS/Kham - RTX1RS2U

May 11, 2017 1:42 PM (UTC+8)