It comes as no surprise. Most New Jersey drivers just don't obey speed limits.
According to a story on NorthJersey.com, monthly speed data collected by the New Jersey Department of Transportation proves the point. For example, on a portion of Route 287 northbound in Morris County, only 23 percent of drivers kept it below the speed limit on any tested weekday in 2017. On Route 322 in Gloucester county, only 7 percent obeyed the law.
Sen. Declan O'Scannon (R) of Monmouth thinks speed limits should accurately reflect how folks drive. According to NorthJersey.com, this approach is supported by most traffic engineers, but is strongly opposed by others, including the Insurance Institute of Highway Safety.