Driverless buses will appear on some roads in Singapore from 2022 as part of plans to improve mobility in the land-scarce city-state, its transport minister said Wednesday.

Singapore has so far avoided the massive traffic jams that choke other Asian cities like Manila and Jakarta by imposing road tolls, spending massively on public transport and becoming one of the world's most expensive places to own a car.

It now plans to embrace self-driving technology to further reduce reliance on cars and improve how people get around.

Driverless buses will be deployed during off-peak traffic hours in three new suburban towns designed to accommodate the vehicles in a pilot project, said Transport Minister Khaw Boon Wan.