The Rolling Road has extra capabilities for measure engine outputs and temp. Most people use them for measuring Horsepower and Torque at the rear wheels. It calculates these two figures by calculating the time to accelerate the big roller between two speeds. As it already knows the circumference and weight of the roller, it can calculate the Horsepower and Torque.
RGS Motorbikes uses a Dyno Dynamics Rolling Road. Enclosed within its own cell with the large air flow fans, capable of flowing 36,000ft