Planning of transportation infrastructure requires analyzing combinations of many different types of geospatial information (maps). Conventional Geographic Information Systems (GIS) or Computer Aided Design systems limit the planner's ability to perceive and effectively use multiple data layers together. To improve the planner's ability to interact with multiple layers of disparate spatial information, we present a novel computer system, which combines vision with haptics (touch) and sound. In this new form of Multi-Sensory Information System (MSIS), visual information is augmented by a three-dimensional haptic device (PHANToM) and by sound (sonification). In a recent study, we investigated how engineering students used this multi-sensory GIS for planning the location (the alignment) of a new road. The results indicate that certain forms of vision, haptics, and audio were used preferentially to represent certain types of spatial data. A generalization of such a multi-sensory approach could provide researchers with the basis for further development and, eventually, the augmentation of established procedures with the MSIS in highway location planning and related areas.