States of Austria arable terrain. The other five states, in contrast, are located in the Alps and thus are comparatively unsuitable for agriculture. Their terrain is also relatively unfavourable to heavy industry and long-distance trade. Accordingly, the population of what now is the Republic of Austria has been concentrated in the former four states since prehistoric times. Austria's most densely populated state is the city-state of Vienna, the heart of what is Austria's only metropolitan area. Lower Austria ranks only fourth with regard to population density even though it contains Vienna's suburbs; this is due to large areas of land being predominantly agricultural.
History of the trucking industry in the United States bus drivers. In 1941, the ICC reported that inconsistent weight limitations imposed by the states were a hindrance to effective interstate truck commerce. Also in 1941, President Roosevelt appointed a special committee to explore the idea of a "national inter-regional highway" system, but the committee's progress was halted by the initiation of World War II. After the war was over, the Federal-Aid Highway Act of 1944 authorized the designation of what are now termed "Interstate Highways", but did not include a funding program to build the highways. Limited progress was made until President Dwight D. Eisenhower renewed interest in the