[Timshel]

There is multiple warnings that the highway will stop starting 1mile before, but the only speed change I could find was less than 50m from the intersection : https://www.google.com/maps/@33.8728257,-118.2900246,3a,75y,...

[jdmichal]

There's two signs before that notifying of both the upcoming speed change and the traffic signal:

https://www.google.com/maps/@33.8729084,-118.2881048,3a,75y,...

I'm also extremely surprised that there's a 20 mph drop. While it's only a recommendation, the Uniform Vehicle Code and Model Traffic Ordinance suggests never changing the speed more than 10 mph at a time, and having no more than six such changes in a mile.

See page 28 of this PDF, as I was looking for this information specifically in relation to the Florida DOT, which does a pretty good job of following this rule:

https://safety.fhwa.dot.gov/speedmgt/ref_mats/fhwasa1304/res...