This verifies that the speed limit is 45 mph, not the 35 mph that many were reporting. Many suspected that was the case because of the sign in this Google street view image [1], but since that image is from July 2017 it was possible that the speed limit had changed since then. The car in the submitted video drives by that sign, and it still says 45 mph, and there are no new signs between there and the crash site.
[1] https://www.google.com/maps/@33.4350531,-111.941492,3a,75y,3...