What general type/technology of rangefinder
would I want if I need average distance (hypothetical example, here) from my car to a fairly uniform roadside hedge (=fuzzy reflected beam return for sure, & no possibility of optical
rangefinding) while driving along the road at 20-40 mph. Accuracy not too vital (two-to-five-foot errors acceptable); response time in seconds OK (as distinct from milli-seconds). The Leica
engineers tell me "forget lasers," no problem; the radar rangefinder
camp wants several thousand dollars for a possible solution. What else works?