Self-Driving Night Buses on Streets of Seoul

unheard of: 전례가 없는
While self-driving taxis are slowly becoming more common in certain parts of the world, autonomous public transport in city centers is virtually unheard of.

aboard: 탑승한
Welcome aboard the Seoul Autonomous Bus.

caveat: 주의사항
There are some caveats, it’s a night bus, you have to wear a seatbelt, and technically, there is a driver sitting behind the wheel just in case anything goes wrong.

operate: 운영하다
One day, we won’t need anyone at all to operate this bus.

ease the burden: 부담을 덜다
It’s a late-night bus so it can ease the burden on the bus drivers.

limited circumstances: 제한된 상황
at considerable cost: 거액의 비용으로
South Korea is showing that driverless public transport does work, but only in limited circumstances and at considerable cost.