It&#x27;s not entirely clear yet what long-term effect ridesharing will have on city traffic [1] and cities are very invested in keeping that low.  Buses and trains and such keep that traffic lower, at least according to current data.<p>Of course, if ridesharing proves itself to <i>reduce</i> traffic, I wouldn&#x27;t be surprised to find cities experimenting with public-private partnerships to implement them locally.  We have something very successful in DC called Capital Bikeshare that is focused largely on reducing traffic.<p>But, unlike bikesharing, if Uber and kin prove out ridesharing as valuable to DC, I cannot see what the local government would add with their own system, something that I know the DC government <i>does</i> consider.  Capital Bikeshare is so successful precisely <i>because</i> the government is involved.  They can convert a couple street parking spaces or a traffic intersection median into a bikeshare without asking anyone, and have done so with no real complaint.<p>[1] <a href="http:&#x2F;&#x2F;fivethirtyeight.com&#x2F;features&#x2F;is-uber-making-nyc-rush-hour-traffic-worse&#x2F;" rel="nofollow">http:&#x2F;&#x2F;fivethirtyeight.com&#x2F;features&#x2F;is-uber-making-nyc-rush-...</a><p>[2] <a href="https:&#x2F;&#x2F;en.m.wikipedia.org&#x2F;wiki&#x2F;Capital_Bikeshare" rel="nofollow">https:&#x2F;&#x2F;en.m.wikipedia.org&#x2F;wiki&#x2F;Capital_Bikeshare</a>