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To improve accessibility in the pedestrian environment, we need to understand better the nature of that environment and how people interact with it. We can consider anyone carrying out an activity in the pedestrian environment as creating a ‘journey chain ’ for the activity. This chain could be as simple as ‘leave house; walk to local shops; return to house’. In this case, the individual ‘links ’ of the ‘chain ’ could arise in streets that the person walks down, doorways into the required shops, and the layout of each shop. The journey could fail if any single link were to fail. For example, the journey would fail if there were a crossing over a busy road with no light control and the person could not walk fast enough, nor was agile enough to miss the oncoming vehicles. From this definition of a ‘journey chain’, a person could be classed as disabled if they encounter barriers in the environment that prevent full and active participation as a citizen. In addition, the numbers of disabled and elderly people are increasing across the developed world. It should be an aim for full accessibility for such disabled people across the pedestrian environment and to do this we need to understand more about how people interact with this environment