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This paper presents a comparison of the available electronic techniques for distance measurement suitable for the off-highway environment. The main techniques described are: ultrasonic passive infrared laser radar FMCW radar impulse radar capacitive vision The techniques are compared across a number of key parameters, including sensitivity, measurement range and cost. A brief description of some of the disadvantages is also included. Finally the paper discusses the use of sensor fusion techniques to overcome the inherent disadvantages of particular techniques.