also are labeled with vertical
lines, to indicate their length. Each vertical
line represents 1000 ft.
connections between runways and the terminal building
are usually built at 30°
angles to the runways. This allows planes to
turn from one to the other without coming to a stop.
Taxiways are labeled
with letters, to indicate the different paths
from runways to terminals.
Airport in Chicago, Illinois, is one of the
busiest airports in the world, with more
than 900,000 take-offs and landings per year.
United States has more than 18,000
airports. More than 8000
have paved runways, while many of the others
have grass runways. Approximately 4900
have lighted runways.
are labeled R and L. For example, two north-south
runways might be labeled R18-36L
highways in the United States are
numbered according to the following system:
east-west highways are even-
numbered, with the numbers increasing from
south to north; north-south highways
are odd-numbered, increasing from west to east.