Nowadays, the Global Positioning System (GPS) can be considered as being the de-facto standard for localization in road networks, delivering a reasonable precision at most places and being available through a huge variety of devices. Nevertheless, if signal reception is disturbed, no position estimates can be computed anymore. In this paper, we present an approach for localization in road networks which is based on a particle filter computing estimates using only basic environmental

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... the road network's structure and its height profile. The approach is demonstrated in experiments of an electrical wheelchair driving through a small town.