chapter  4
24 Pages

Fundamental Design Considerations

Historically, geometric design focussed on two main functions: mobility and accessibility. Of these, mobility seemed to be the more important of the two, with accessibility being relegated to the Cinderella role of a limited focus on local urban streets, whether residential, commercial or industrial. As illustrated in Figure 4.1, these features were seen as a continuum ranging from pure mobility and a total control of access as typified by the freeway to the pure accessibility of the local cul de sac.