In the paper, we describe a series of stages in the development of a new virtual locomotion device designed to enhance remote, interpersonal communications. The latest system, called GSS (Ground Surface Simulator) , inherits the features of two previous locomotion interfaces, i.e. ATLAS (ATR Locomotion Interface for Active Self Motion) and ALF (ALive Floor). GSS also incorporates two different features not found in ordinary treadmills: a movable belt and an active belt speed controller. We built an initial prototype of GSS and developed a method that presents bumpy surfaces free from the mechanical limitations inherent in prior designs. Experimental results showed that the subject could distinguish a 1% difference in the virtual slope on the GSS.