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Got it. I've driven I-40 from the other end at least once, but didn't notice that at the time.

Here it is screen capture from Google Maps street view. The sign is at the I15/I40 split, right as or right before I40-W starts to curve North (away) from I40-E to merge into I15.

Yep. BTW I-15 curves North(ish) to head to Vegas, whereas I-40 stays East...

I'm pretty sure I've only taken I-40 once, to go to Laughlin NV. Which considering how much I hate Vegas, and Laughlin is like Vegas without the glitz and glamour, is why I've never gone that way since lol...

I've been by there more times than you then but the first time is the most interesting, it was at about 11pm on January 1, 1997:

January 1, 1997 started EARLY. My parents, brother, and I drove to California for the Ohio State vs Arizona State Rose Bowl. Well, dad, brother, and I were there for the game. Mom's price to green light the trip was that she wanted to see the Rose Parade so we woke up in our hotel at 0-dark-thirty, packed everything in the van, and drove to the RoseBowl where we parked on the adjacent golf course at about dawn then headed up the hill to Colorado Boulevard to get a view of the Parade.

After the Parade we walked back down the hill with the other 100k people heading to the game and waited for the Stadium to open.

Ohio State beat ASU and Jake "the Snake" in a very exciting game and after the game we headed toward home. We headed West out of Pasadena then North on I15 to Barstow where we saw that sign on our way onto I40 East.

We spent the night near Needles, California then drove straight through from Needles back to Ohio (I40E->I44E->I70E->I71N).

THIS DAY IN HISTORY: 

Winston Churchill's "Iron Curtain" Speech (1946)
The phrase "Iron Curtain" refers to the political, military, and ideological barrier erected by the USSR after WWII to seal itself and its dependent eastern European allies off from contact with the West. Churchill's use of the phrase in a 1946 speech at a US college, though initially perceived as antagonistic, popularized the term. The Iron Curtain largely ceased to exist in 1990, when the communists of eastern Europe finally abandoned one-party rule.

Damn European types hopefully they don't migrate anywhere