Fire engine response times are up 18 seconds. The response to medical emergencies is up 22 seconds.
Scoppetta says the union is telling drivers to stop at all red lights and stop signs while heading to calls even though regulations, don't require a stop.
Union leaders call the commissioner's charge "ridiculous" but Scoppetta says the union campaign began after a spectacular fire truck crash in the Bronx last July.
A civilian was killed when the fire rig went through a red light at 30 miles an hour.
The FDNY took disciplinary action against the rig's driver and a fire officer.