Many different organizations are interested in using the area above and below the streets. One of the most important things is to co-ordinate and harmonize the various areas of interest. The purpose of this report is to show who decides how the street zones in cities are used; to show different organizational solutions chosen to share access, and the type of laws that form the basis of this work; to define those who have an interest in using street zones and the conflicts that arise; to show the basic evaluation and control systems used to weigh up the different interests; and to show the important of "traffic control centres" in large cities.

This special issue also contains the two following reports Priority for Public Transport and Other High Occupancy Vehicles (HOV) on Urban roads and Urban Road Design and Architecture .