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Preface
e basic concept of transportation—the movement of goods and people
over time and space—has changed little since the Romans developed their
transportation system over two thousand years ago. Today we have far
more extensive transportation infrastructure systems that include roads,
waterways, railways, and air transport options, and much more sophisti-
cated technology than in the past, but the overall objective of transporta-
tion engineers remains the same—to plan, design, construct, and maintain
the various transportation modal systems in the safest and most ecient
manner possible. To achieve this goal, transportation professio