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All phases of road developmentâ€"from construction and use by vehicles to maintenanceâ€"affect physical and chemical soil conditions, water flow, and air and water quality, as well as plants and animals. Roads and traffic can alter wildlife habitat, cause vehicle-related mortality, impede animal migration, and disperse nonnative pest species of plants and animals. Integrating environmental considerations into all phases of transportation is an important, evolving process. The increasing awareness of environmental issues has made road development more complex and controversial. Over the past two decades, the Federal Highway Administration and state transportation agencies have increasingly recognized the importance of the effects of transportation on the natural environment. This report provides guidance on ways to reconcile the different goals of road development and environmental conservation. It identifies the ecological effects of roads that can be evaluated in the planning, design, construction, and maintenance of roads and offers several recommendations to help better understand and manage ecological impacts of paved roads.
Part I. Highway classification is studied of primary state highway systems, which comprise the principal interstate and intrastate routes of all states and territories. Part II. A comparative analysis is presented of statutes pertaining to system classification below the state primary level -- state secondary highways, local rural highway systems / country, town, and township/, and municipal highway systems.
This document lists the principal terms used in combined transport or related to it. All the definitions referring specifically to the geographical framework of Europe may be applied to other regions of the world. They are intended for the work of ...