S30137 Microplastics Phase 4

This work order will help National Highways better understand and manage the growing environmental risks associated with microplastics and other emerging pollutants generated by the Strategic Road Network. Existing guidance and assessment methods were developed before the full scale of concerns around microplastics, particularly tyre wear particles, became apparent, meaning there are recognised evidence gaps in current policy and design standards. This project will provide robust, year-round monitoring of highway d...