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Literature used and other materials:
- Mobile Kommunikation für Jedermann by : Rainer Kolbeck
- Hans Hajer
- Clemens Bail
- aus dem : Markt&Technik Verlag
- traffic map of Cologne and Dinslaken
- Chart on traffic density at specific traffic lights
- Videotapes of several rescue missions
- Map of traffic lights around the "Europaplatz" in Cologne
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