Not true. The Specialized Turbo goes up to 45 km/h with some assist.

" e-bikes must have a motor of less than 750 watts and an unassisted speed of less than 20 mph. Because the Turbo is an electric pedal-assist bike, meaning you have to pedal to get any kick from the motor, the speed limit doesn’t apply. In fact, the only reason it tops out at 28 mph is to comply with European laws, which restrict e-bikes to 45 kph. Specialized installed a governor on the Turbo that automatically turns the motor off when it reaches this speed."

http://www.outsideonline.com/outdoor-gear/bikes-and-biking/B...