Here is a curious question that is at the back of my mind.
I wonder why Caltrans or AASHTO signed Interstate 15 to the Ontario and Corona Freeways, the alignment looks like a bypass. And Interstate 215 (Former Interstate 15E, U.S. 395), Barstow & Mojave Freeway, San Bernardino Freeway, Riverside Freeway, Pomona Freeway, Moreno Valley Freeway and the Escondido Freeway(s) is a bypass of Interstate 15?
The last time I was in the San Bernardino area, or Inland Empire was during a trip to Oro Valley, AZ and I navigated the proper route to get from Interstate 210, and California 210, bypassing the original routing of Interstate 210 at San Dimas to near Pomona to Interstate 10 on the San Bernardino Freeway (which is now signed as California state route 57, Orange Freeway). After reaching the Foothill Freeway extension to Interstate 15, Ontario Freeway, we used the inverted four level stacked interchange, I-15/I-10 to reach the San Bernardino Freeway. And I wonder when this interchange was constructed near Ontario, CA?