Not that I'm saying anyone should be doing highway speed on Union, but can you imagine doing 25 on it?!
The only place I can ever justifiably do 25 mph or less is in a school zone or if I know children are present. Everywhere else has wiggle room.
If someone told me to go 25mph on a Blvd, Turnpike, Expressway, or anything that usually is between 45-55mph, I'd excrement myself and then proceed to break the traffic law without blinking an eye.