The term "frost law" refers to the amount of frost that is remaining in the ground. With the warming of the ground as spring approaches, it can cause the pavement to heave and buckle, thus creating potholes and drops that can have a  damaging effect on wheels and vehicles. To help reduce the damage to the roadway, counties enforce axle weights reductions depending on the road surface.With spring officially just a little over two weeks away, the County Road Association of Michigan is gearing up for the return of seasonal weight restrictions. Six of Michigan's 83 counties have already imposed frost law restrictions. When the laws go into effect, truckers will see their maximun load capability reduced by about 35%. Roads designated as Class A roads (M-24, M-53, and I-69) are built to all season standards and are not affected by the frost laws.