Blue Diamond Road does have driveway access, but its access is controlled by a central median and only accessible from the other side of the road via U-turn slip lanes in the median or at signalized intersections, rather than frequent median breaks or a central turn lane. While it's not fully-controlled access, the road is designed to handle large amount of traffic at highway speeds as opposed to the typical arterial like Rainbow which has far more driveway/side street access and lower speeds.