Truly a large part of a bygone era, RIR was one of the greatest race tracks ever created. The best drivers of their time competed (and some died) at World-Class events there. RIR appeared in numerous movies and TV shows over the years and had many celebrity drivers / visitors. It was considered a challenge just to stay on the track; winning a race was incredibly difficult and several legendary drivers lost their lives in the attempt.
I grew up in the high desert approximately 80 miles from RIR, so it has always been somewhat near and dear to me and I never felt that existing iterations of RIR for the any of the Sims truly captured it's essense. My primary goal was to recreate the original terrain topography and track elevations as accurately as possible and, give or take a few feet or so here & there, I feel that I have been successful. Having been to RIR several times, I have seen its many changes and I remember each era's iconic features, so I elected to avoid being limited to a certain year's appearance and have instead included my favorite features from the 1970s to the late 1980s.