"Public transport systems haven't changed for decades and are one of the last mobility frontiers to evolve," said Tom Kirschbaum, co-founder and managing director of door2door.

Watch more Tech Stories, a running series of short documentaries from the award-winning reporters at TechRepublic: https://www.youtube.com/playlist?list=PLlkW2NIMmzSa4voiYHQSDqTQMPFf2zQV-