Copyright © National Academy of Sciences. All rights reserved.
This executive summary plus thousands more available at http://www.nap.edu
Assessing and Managing the Ecological Impacts of Paved Roads
http://books.nap.edu/catalog/11535.html
xxiii
Contents
SUMMARY................................................................................................. 1
1
INTRODUCTION ............................................................................. 14
Committee Charge and Response, 17
What Is Different and New in This Report? 24
Organization of Report, 31
2
HISTORY AND STATUS OF THE U.S. ROAD SYSTEM.................... 37
Introduction, 37
A Brief History of the U.S. Road System, 37
Definitions and Characteristics of Roads, 41
Ownership and Maintenance Responsibilities, 54
Current Status and Future Trends, 54
Summary, 60
3
EFFECTS OF ROADS ON ECOLOGICAL CONDITIONS................... 62
Introduction, 62
Definitions, 63
Ecological Condition—Ecosystem Goods and Services, 65
Literature Review, 66
Information Gaps, 95
Summary, 96
This executive summary plus thousands more available at http://www.nap.edu
Assessing and Managing the Ecological Impacts of Paved Roads
http://books.nap.edu/catalog/11535.html
xxiii
Contents
SUMMARY................................................................................................. 1
1
INTRODUCTION ............................................................................. 14
Committee Charge and Response, 17
What Is Different and New in This Report? 24
Organization of Report, 31
2
HISTORY AND STATUS OF THE U.S. ROAD SYSTEM.................... 37
Introduction, 37
A Brief History of the U.S. Road System, 37
Definitions and Characteristics of Roads, 41
Ownership and Maintenance Responsibilities, 54
Current Status and Future Trends, 54
Summary, 60
3
EFFECTS OF ROADS ON ECOLOGICAL CONDITIONS................... 62
Introduction, 62
Definitions, 63
Ecological Condition—Ecosystem Goods and Services, 65
Literature Review, 66
Information Gaps, 95
Summary, 96