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There are many user interfaces already available to drive electric wheelchairs. These enable users to convey their intention explicitly to the wheelchair control system. However, we have observed users who find it nonetheless extremely difficult to do so. For some severely disabled users it is almost impossible to drive a conventional electric wheelchair in a safe way. This paper explores several ways of implicit communication to assist the user to perform daily manoeuvres. Some initial user trials have been performed at a hospital. The results are evaluated and conclusions are drawn on the selection of suitable human-robot interaction techniques.