3: Why isn't the highway straight?
have learned about the geologic processes that shape the surface of
Iowa, and we have learned how earth materials are used to build highways.
Let's take a few minutes to discuss the function of highways and the
process it takes to plan them.
are highways? -- Learn about the
decides where highways are built?
How do they make the
decisions?-- Understand who works
together to build
takes care of the highways? --
Learn who is responsible
for the maintenance of the highway after
it is built.
aren't highways always straight?
-- Understand the
process of road design.
3 Glossary -- Practice using the
terms and definitions
included in this unit.
3 Activities -- Activities will
allow students to reinforce
the informational materials covered
in this unit.
What are highways?
A highway is a road that is designed to
carry traffic at high speeds. Highways are part of a transportation
network that links cities, states, and even different countries.
Other parts of the transportation network include railroads, airplanes
and boats. This transportation network enables the quick movement
of people and goods from one place to another.
Another aspect of the highway
system often forgotten is the need for national defense. Our
current Interstate Highway System was originally constructed by the
Department of Defense to allow rapid troop movement.
3 B. Who decides where higways are built?
How do they make the decisions?