Companies in other countries are also developing self-driving taxis. However, their common challenge is to guarantee the safety of passengers.

NuTonomy, a tech startup created by former engineers from the Massachusetts Institute of Technology, launched its self-driving taxi service in a limited area in Singapore in August 2016, making it the first company to make autonomous taxis available to the public, tech news website BGR.com reported.

Ride-hailing service Uber has been testing self-driving cars in cities across the United States. But one of its autonomous cars, with a human driver behind the wheel, struck and killed a woman in the state of Arizona in March, The New York Times reported.

In China, ride-hailing company Didi Chuxing and search engine Baidu are also developing self-driving cars.?

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