A motorcycle rider initially missed this right curve and turned too late.   

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Several reflective pylons were missing from the "island" straight ahead and the streetlight over the island was not functioning at the time. 

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The driver who crashed, was on a motorcycle with one headlight of unknown aim. At distances further from the curve than this point, the turn is much less obvious.

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In addition to the camera and flash techniques employed, a light meter was used to measure the light striking the surface from adjacent light sources.

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