"except when reduced speed is necessary for safe operation or in compliance with the law"Sure it is.
Try doing the 55mph limit on 80/94 in Indiana near the Illinois border. You will be pulled over by cops at best for impeding traffic, quite literally killed at worst.
“A person may not drive a motor vehicle at a slow speed that impedes or blocks the normal and reasonable movement of traffic, except when reduced speed is necessary for safe operation or in compliance with the law. A person who is driving at a slow speed so that three (3) or more other vehicles are blocked and cannot pass on the left around the vehicle shall give right-of-way to the other vehicles by pulling off to the right of the right lane at the earliest reasonable opportunity and allowing the blocked vehicles to pass.
What is the speed limit? A suggestion?
The above statute would apply up until the speed limit is broken.