[Cirrus]

In my relatively limited and non-expert experience, pedestrian all-way crossings are often done to benefit drivers more than pedestrians. You put them at intersections where the pedestrian volume is so high that using a normal signal right-turning drivers can only squeeze through one or two per cycle. Making an all-way pedestrian crossing adds wait time for pedestrians in order to give right-turning drivers a cycle to get through in larger numbers.

That's how they've been used in DC. I really don't know about Denver.