By 1940 modern helicopters were invented.
After 10 years of depression and 5 years of war the streetcar companies had made lots of money during World War II since automobile gas and supplies were rationed, but by1947 streetcars were eliminated because they were too old and damaged.
Aircraft transportation was not very common by 1950, plane trips were bumpy and noisy. But by late 1950's Boeing jets were invented, they could fly faster, reach higher altitudes, and fly above turbulent weather.
President Dwight Eisenhower thought building Interstate roads was good for the national security, in case a nuclear war would start the population would need good roads to evacuate and to move military equipment.
Transportation was important to this period of time because, as president Ike mentioned, it helped to transport and move military equipment during the war or future wars. It is also related to something discussed in class, "duck and cover", because i guess one way you could protect and cover yourself from bombs is getting inside or underneath your car.
Sources:
www.lib.niu.edu
www.skwirk.com
www.livinghistoryfarm.org
