A cost zone about an origin on an digital map includes the area on the map that can be traveled to, from the origin, which has a cost of travel less than a predetermined cost. The cost can be measured in distance, time of travel, ease of turning, tolls; etc. The steps of creating a cost zone include...http://www.google.de/patents/US5729458?utm_source=gb-gplus-sharePatent US5729458 - Cost zones
