The posted speed limits in most of the state of Hawaii are probably determined illegally. According to the federal regulation manual, Manual On Uniform Traffic Contro Devices (MUTCD), it states that speed limits are to be determined by a speed survey. This is where the 85th percentile average speed of vehicles is determined. The posted speed needs to be rounded up to the nearest 5mph, not down! Through my research, Hawaii doesn’t do this! Check out the website: http://mutcd.fhwa.dot.gov/kno-faq.htm
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