Tarmac is a stone and hot tar bound product, it a low cost product , but very hard wearing. Tarmac can be used from household drives to large car parks and offers both one coat and two coated surfaces.
One coat can be hard wearing at low cost (standard depth 50mm compacted), where as two coated option of binder course and wearing course at depth of 50mm & 25mm gives you a good foundation and smooth top coat surface.