Requires posted speed limit on certain limited access highways be based on speed at which 85 percent of vehicles are traveling; designated as Speed Limit Sanity Act.

This bill requires New Jersey's state-managed limited access highways to have posted speed limits based on the speed at which 85% of vehicles travel, as determined through traffic engineering studies. It mandates that the Commissioner of Transportation set speed limits using this 85th percentile standard rather than default limits, applying only to highways designated as "eligible limited access highways" under state jurisdiction. The law repeals prior provisions (P.L.1997, c.415) and specifies that speed limits must be set through documented engineering analysis, including speed surveys. This directly affects state highway authorities and drivers on these specific highways, replacing fixed speed limits with data-driven standards.