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 low enough to permit vehicle or foot travel, 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</ref> and may be required to meet standards set by law or official guidelines.