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The radar has revolutionized this and made sure that human error cannot play as big a role as the former may have made in aviation.
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Previously, it was radio contact, map and human coordination from the control towers, which made sure that air travel went, as it should. War is generally a terrible time, but within the field of technology pushes the participants to the utmost to find an advantage, allowing many inventions that is especially beneficial for traffic. Radar has now been created as an aircraft radar so that it can be useful in peaceful times and thus ensure that air traffic is much better than it ever has been before. That this has later been used for more civilian tasks must be said to be a perfect situation for all parties. WW2 is a good example of this, where the radar played a major role in the Allies’ ultimate victory. Many of the greatest technological advances are made in connection with the military, and especially when you are at war. The radar allows the control towers and aircraft to see what else is in the air space, and thus avoid collision. It’s all been made possible by the radar, which plays a very important role in the coordination of air traffic. When one thinks of how air traffic is coordinated, one is often surprised that there are no more accidents than what happen when you have a lot of big machines that fly very quickly to land the same place.