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| - Examples of direct line-of-sight detection systems used to prevent collisions between vehicles and pedestrians or other objects can be seen in U.S. Pat. Nos. 4,543,577 and 4,549,181 to Tachibana et al., U.S. Pat. No. 6,223,125 to Hall, U.S. Pat. Nos. 5,983,161, 6,275,773, and 6,487,500 to Lemelson et al., U.S. Patent Application Publication No. U.S. 2002/0110261 A1 to Yanai, and U.S. Patent Applic
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