Superior alternatives, like walking and cycling, to the currently dominant, massively lethal, and unjust road-transport paradigm (WHO 2008; WHO 2009) strongly recommend themselves also for greater efficiencies of space, time, energy, carbon sinks, etc. This paper examines the relationships between speed of travel and uses of space, finding firstly that as speed increases, effective mobility decreases. Thus walking and cycling towns can have higher effective mobility than driving towns, due to the structure and pattern of space-use. An inverse relationship of speed and effective mobility is centred on the dynamic that as speeds (plus directions of movement) increase, transport modes (i.e. vehicles and infrastructures) require more space, for safety reasons. Moreover, a range of spatial / transport relationships are revealed when inquiring into non-injurious transport forms. (1) The mobilities of all bodies are inter-related. A body moving faster in more directions means that all other bodies must move less. So as bodies move slower, freedoms of movements are more equally shared. (2) Mobility is relative to what a space contains. With slower movement (e.g. walking city), a space can contain more bodies, and the ability to achieve goals within a space is increased. By limiting speeds, more people and activities can be contained in a space, and thus the mobility of a person - the ability of that person to move effectively within space - increases. (3) A definitional change therefore becomes necessary: effective (real) mobility is related to capabilities over time not distance over time. (4) Inquiry into non-injurious transport forms points to additional two qualities of mobility choices: (a) super-coherent - where key qualities of parts of a system (e.g. health-promoting) tend to be reproduced throughout the system, and (b) Senian-optimal - positive rates of exchange / sharing of freedoms ("Senian" instead of "Pareto" optimal, the latter focused on exchange of utilities).

WHO World Health Organization, (2009), Global status report on road safety, http://whqlibdoc.who.int/publications/2009/9789241563840_eng.pdf  

WHO World Health Organization, (2008), The global burden of disease: 2004 update, http://www.who.int/healthinfo/global_burden_disease/GBD_report_2004update_full.pdf