Driveways built on prep that lasts, not a thicker mat over a bad base.
Call For A Texas Portfolio EstimateCentral and North Texas sit on Blackland Prairie clay with a plasticity index high enough to lift and drop a slab through a single wet-dry cycle. Thickening the mat does not fix that; treating the subgrade and building a base that drains does. In the Valley the problem inverts — a high water table and saline soils attack from below.
TxDOT Standard Specifications — Item 341 dense-graded hot-mix asphalt over Item 247 flexible base, with lime or cement treatment where the subgrade calls for it