A primary aim of presenting a methodology is to provide an efficient and simplistic measure of sustainability for a network. In this case, the measure is assessed in an “environmental sustainability – accessibility space”. The measure assists in the quantification of environmental and accessibility performance. The space is therefore effective in assessing and visualising the performance of the proposed or theoretical infrastructure. However, this performance evaluation is very arbitrary and a standardised methodology is required.

Environmental-Accessibility Space

From this, we aim to provide a risk analysis will assist in determining a tolerance range and provide a visualisation in the “acceptance” of a travel zone pair or spatial area. Thereby assisting in decision making or the overall assessment in the performance of any spatial scale, such as the city of Sydney. The product is also effective in presenting to the public or relevant stakeholders whom lack the knowledge of sustainability or the values in the metrics. Although the visualisation is simplistic, it is effective in its purpose. However, an absolute range needs to be selected. Due to the differences in public opinion and values in different communities, an agreement or compromise is required on this decision. The ranges may be determined by community engagement or a combined decision by representative stakeholders of a city or community.