Local Road Management Manual 19 Chapter 8 – Local Road Environmental Safeguards. This chapter discusses environmental management practices to ensure the environmental and social sustainability of local roads. The safeguards are based on the national framework for environmental management of road projects. III. Overview of the Philippine Road Network The Philippine Road Network is an integral component of the country’s transportation infrastructure. Roads are classiifed as National or Local Roads. Total Length 217,643.57 km