Abstract
This article presents modifications to the vehicle ground pressure criterion of Mean Maximum Pressure (MMP). There is an introductory explanation of why MMP is preferred to other ways of expressing ground pressure. The main modification concerns the relationship for wheeled vehicles of tyre deflection to tyre size. Earlier, deflection had been in relation to tyre height; now it is to tyre diameter, which allows truer representation of low-profile tyres. This has required revised constants in the formulae, and new standardised deflections for normal comparisons. There are also developments to the MMP formula for wheels in sand. Aspects with scope for further research are described.
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