From the NJ AP story:
The state trooper-driven sport utility vehicle was in the left lane with its emergency lights flashing when a pickup tried to get out of its way. Instead, it set off a chain reaction that resulted in the crash.
Apparently, the Guv’s SUV was also traveling slightly above the posted limit of 65 mph–91 mph–perhaps prompting the pickup truck’s driver to hastily and clumsily switch lanes.
Thx to Breitbart