山区旧路改造受着技术、投资、地形等储多因素的限制,与新建公路尤其是高等级公路建设有着本质的区别,有它本来的特殊性。主要表现在:技术标准低,投资非常有限,地形地貌地质条件差,行车干扰等方面。由于受投资、地形、交通量等客观条件的限制,老路改造在技术标准采用上往往表现着牵强性,如防护工程、环 The reconstruction of the old mountain roads is limited by many factors such as technology, investment and topography, and is essentially different from the construction of new roads, especially high-grade highways. It has its own particularity. Mainly manifested in: low technical standards, very limited investment, terrain and poor geological conditions, traffic interference and so on. Due to the restriction of objective conditions such as investment, topography and traffic volume, the transformation of old roads often exerts far-reaching effects on the adoption of technical standards such as protection projects,