MOT Type 2 Subbase or just Type 2 is an unbound mixture of aggregates that is defined by Clause 804 of the Standards for Highway Works. It is used as a subbase in construction work.
The material will be crushed down to 63mm down to dust. It differs from MOT Type 1 because it has more fines in the material due to a larger percentage of fine materials passing through the smaller sieve sizes.
Also, the supplier of the material doesn’t need to declare any grading ranges.
The grading requirements for MOT Type 2 were set out by the Ministry of Transport in the UK, hence the ‘MOT’. Although the official name for the material is just Type 2 Unbound Mixture.
These materials include natural sands, gravel, crushed rock, crushed slag, crushed concrete, and recycled aggregates.
If you are looking to use MOT Type 2 within the construction of highways it must meet clause 804 in the Specification for Highway Works.
The details for the specifications are below: