That.... doesn't really make any sense. I've never seen a road where opposite lanes of travel had different speed limits.

edit Now it makes sense.

I went through Google Street View. Northbound on Mill Ave, from before Curry Road to afterward, is 45mph. https://www.google.com/maps/@33.4350531,-111.941492,3a,75y,3...

Southbound on Mill Ave, and on Center Parkway, there are no southbound speed limit signs posted. But after the Curry Road intersection, there is a 35mph sign. https://www.google.com/maps/@33.4371031,-111.9433154,3a,75y,...

I thought the Uber was north of Curry Road going south, but after comparing the video to the map, it looks like the Uber was south, heading north to the intersection. The road opens up and there are two metal signs. https://www.google.com/maps/@33.4362927,-111.9424451,3a,75y,...

So, yes, the speed limit on the road in the direction the Uber was traveling on the stretch of road it was traveling was indeed 45mph.

Also, very sadly, at the point of impact, there was actually a sign that said "Do not cross; Use Crosswalk ->". https://www.google.com/maps/@33.4365489,-111.942659,3a,22.9y... Although not facing the direction the bicyclist was crossing from. I'm willing to bet an accident had happened here before.