a major challenge. the biggest i would say challenge is to properly process as the g.p.s. signals and it's very nice to show that on the map power actually recall is morning so and was an e.t.a. expected time of arrival to the bus stops old that takes quite a lot of efforts and we've been doing this for twelve years and we still keep updating and i'm dating can improving delegate times who does that traffic is used in over thirty cities worldwide now even in megacities like indonesia capital jakarta it's free for users. founders are also in talks with german city administrations though things are moving only slowly that the transport companies are reluctant to part with data on real time operations and centralized ticket sales the mayor of vilnius had no such qualms the policy do implement here even this is the most radical open to the policy it's open data and just being very open