Robots are increasingly tested in public spaces, towards a future where urban environments are not only for humans but for autonomous systems. While robots are promising, for convenience and efficiency, there are challenges associated with building cities crowded with machines. This paper provides an overview of the problems and some solutions, and calls for greater attention on this matter.1 Urban Environments, Not Just for Humans: a Problem? Urban environments will increasingly be spaces for autonomous systems, of which automated vehicles is only one popular type. Modern, but so far less common, forms of transport for people could be Segway type devices such as Loomo 1 and various kinds of delivery robots for goods.Robot wheelchairs could be used in public as well other robot-transporters to help the elderly. Also, indoors, there are robots helping to carry bags in hotels, e.g., Sheratons robots, 2 robots helping to transfer supplies and lab specimens in hospitals, robot trolleys (and other robots in shopping malls). There are now more examples of robots for hotels. 3