Globally, 13% of global resources consumed relate to mobility. This includes transport infrastructure, from roads, to rail, to cycle routes (Ellen MacArthur Foundation). Virgin materials sourced to build mobility infrastructure often include cement and asphalt, which are responsible for a significant portion of global greenhouse gas emissions (cement—a constituent component of concrete—is responsible for an estimated 8% of global greenhouse gas emissions) (BBC).

The materials that are required for the construction of transport infrastructure can be sourced from residual materials, to offset the demand for virgin resources. Construction techniques that utilise residual material are often less intensive in relation to greenhouse gas emissions, and can help to lower the material footprint of mobility infrastructure. A range of residual materials can be used within mobility infrastructure. These can come from conventional materials, such as cycled concrete and other stones and aggregate. As well as other residual materials such as plastics and rubber from end of life tyres.

Local governments can support the cycling of materials for mobility infrastructure by mandating a certain proportion of recycled material input in tenders for new developments or renovations of existing infrastructure. For example, criteria could stipulate that all residual materials within renovations must be cycled back into the project, for example as aggregate. Alternatively, criteria could stipulate a minimum proportion of material inputs from cycled sources, or ban the landfilling of certain residual materials. Collaboration and engagement with local businesses can help local governments to identify the most appropriate criteria that the local market is able to satisfy, and support the most effective transition towards a more circular economy.