Uber may be shredding business models for taxi firms the world over but it is struggling to make inroads in Japan, where risk-averse passengers prefer to stick to their high-quality traditional taxi service.

Japan, with its wealthy customer base and megacities like Tokyo, should represent rich pickings for Uber.

In 2015, the national market for taxis had a turnover of 1.73 trillion yen ($15.2 billion), according to transport ministry data.

There are 50,000 taxis in Tokyo alone -- instantly recognisable with their impeccable polished exteriors and doors that open automatically to let valued customers board effortlessly.

And with hailing a taxi rarely taking more than a few seconds in the major cities, there has been sluggish take-up of Uber, where consumers order an unlicensed car via smartphone.