Before revision: Construction Layers in the construction of a mortarless pavement: A) Subgrade B) Subbase C) Base course D) Paver base E) Pavers F) Fine-grained sand In transport engineering, subgrade is the native material underneath a constructed road.Sub-base layer composed of cement-based material being applied during construction of the M8 motorway in Ireland Road construction in MyanmarRoad construction requires the creation of an engineered continuous right-of-way or roadbed, overcoming geographic obstacles and having grades The Construction of new roads, asphalt's Washington |year=2006 URL |format=Doc |access-date=2007-04-20 |url-status=dead URL |archive-date=July 9, 2006 </ref> and may be required to meet standards set by law or official guidelines.
After revision: Construction Layers in the construction of a mortarless pavement: A) Subgrade B) Subbase C) Base course D) Paver base E) Pavers F) Fine-grained sand In transport engineering, subgrade is the native material underneath a constructed road.Sub-base layer composed of cement-based material being applied during construction of the M8 motorway in Ireland Road construction in MyanmarRoad construction requires the creation of an engineered continuous right-of-way or roadbed, overcoming geographic obstacles and having grades The Construction of new roads, asphalt's Washington |year=2006 URL |format=Doc |access-date=2007-04-20 |url-status=dead URL |archive-date=July 9, 2006 low enough to permit vehicle or foot travel, and may be required to meet standards set by law or official guidelines.