Rethinking transport infrastructure planning to extend its value over time

Contemporary transport infrastructure planning is typically built upon the core belief that physical mobility has inherent advantages and that more of it will always yield better socio-economic outcomes. Such an embrace of maximum growth yields a misguided calculus for planning transport infrastructure. Rather than seeking to meet the demand for future mobility by reflexively expanding the quantity of infrastructure, there is a need to consider alternatives that can support a sustainable future. By applying the ‘half-life’ concept to transport infrastructure, this paper explores alternatives to extending its use in perpetuity that open up a wide range of possibilities.