Over time, vehicle load pressure causes subgrade soils to migrate into the aggregate base of the pavement section. Contamination of the aggregate base by the subgrade results in the reduction of the effective base thickness to less than originally designed. Reduction of the base thick-ness results in a decrease in the load-carrying capacity of the aggregate base and a reduction in the pavement life. Geotextiles prevent the subgrade materials from migrating into the aggregate base, thus increasing pavement life.