MOT Type 1, often called Type 1, is a specific aggregate material used in road construction and other civil engineering projects. "MOT" stands for "Ministry of Transport," which refers to the United Kingdom's Department for Transport, where this material specification originated. However, similar materials and specifications are also used in many other countries. MOT Type 1 is a well-graded granular material typically consisting of crushed rock, crushed limestone, or crushed concrete. It is used as a subbase or base layer in various construction applications, including road construction, pathways, driveways, and foundations. Here are some key characteristics and purposes of the MOT Type 1 subbase: Load-Bearing Capacity: MOT Type 1 is chosen for its excellent load-bearing properties. It provides a stable foundation that can evenly distribute the weight of vehicles and structures, reducing the risk of settlement or deformation. Drainage: This material is designed to allow for good drainage, which helps prevent water from accumulating on the road surface or beneath it. Proper drainage is crucial for maintaining the integrity of the road and preventing water-related damage. Compaction: MOT Type 1 can be compacted to create a firm and stable subbase. Proper compaction ensures the material can withstand the loads and traffic. Gradation: The material is well-graded, containing a mix of different-sized particles. This gradation helps achieve optimal compaction and stability. Compatibility: MOT Type 1 can be used as a base layer beneath asphalt, concrete, or other surfacing materials. It provides a solid foundation for the upper layers. Sustainable: Using crushed recycled concrete as a component of MOT Type 1 is environmentally friendly and helps reduce the demand for new raw materials. It's important to note that the specific requirements for MOT Type 1 can vary by region and country, as there may be different specifications and standards in place. Contractors and engineers follow local regulations and guidelines when selecting and using MOT Type 1 or similar materials in construction projects.