I am writing to provide perspective on the rear turn signal color. I was with Volvo in the 1960s and -70s mainly with vehicle and equipment specifications for the various regulations and market needs in North America. Before the advent of Federal Motor Vehicle Safety Standards, this meant specifying the vehicle configurations so they met all state standards. At that time, many state standards specified red for rear turn signals, but when FMVSS 108 came in for the 1968 model year and superceded different state standards, yellow became an allowable color nationwide. Volvo switched almost all US models immediately (the exception was the 1800, which was switched to yellow when the new 1800ES model came in 1972) because a yellow rear turn signal was more conspicuous and less ambiguous, and Volvo was pursuing a safety-first philosophy. This was not done as a cost-saving or parts-consolidation measure. There still had to be US-specific rear lamp assemblies because of different photometric requirements for SAE versus the European ECE standards. The difference between the '67 and '68 models was just a different color of plastic for the turn signal portion of the multi-function rear lamp assemblies. There was no cost saving or penalty. From 1968 until this year, Volvo used only yellow rear turn signals in the US.
Now this year, the new XC-90 came out, with red rear signals as described on https://tinyurl.com/hsw9ojk (see attached). After I went and confirmed this is in fact the case -- despite a large rear lamp with ample room for a US-size yellow rear turn signal, they have chosen to use red -- I wrote to Volvo expressing my dismay about it. As you can see (attached), they basically blew me off: Get lost, buzz off, they're winning awards with the XC-90. Look at their claims that the XC-90 is "the best of what Volvo has to offer" (No, the rear turn signals are not the best, and Volvo knows it) "the beautiful design" (which apparently takes precedence over optimal crash avoidance through yellow turn signals Volvo chose for safety reasons almost half a century ago) and "exceptional safety features" (except for the demonstrably inferior turn signals).
Clearly this is how makers see it: red and yellow are equally as legal, so it's an ornamental feature like paint color or the wheel styling or the typeface on the nameplates. Car buyers who know and care about the difference are left out in the cold -- the makers clearly don't care because they don't have to, and the level of follow-the-herd benchmarking in today's auto industry is such that they all pretty much copy what each other is doing. This is true even as the industry has come right out and said yellow (amber) turn signals do a better job, as GM did 17 years ago on the GMC Yukon (attached, a GM press release archived at https://tinyurl.com/p752kzc ). then they changed the Yukon back to red with the next design refresh!
I went to the NAIAS Auto Show in Detroit this past week, and was disappointed to see a big proliferation of red turn signals. All Audis, all Mercedes, all VW, all BMW except the low-volume i3 and i8, all Porschss, all have red. The high-volume Honda Fit has switched from yellow to red. The high-volume Chevy Cruze, yellow up to now, has been changed to red except the hatchback. Numerous models from GM, Ford, FCA, Nissan, Honda, Toyota, Hyundai, Kia, and other makes use red. Many of them are package-protected so they COULD be yellow with a snap decision and scant or zero extra expense...maybe it'll be next year's "facelift"? Appropriate policy should not let safety devices be treated as ornamental playtoys.
There is no effective mechanism for the consumer to demand things like yellow turn signals. So I am encouraged to see NHTSA considering adding such a mechanism, though I am discouraged to see it is such a weak and partial one. Yellow rear turn signals are clearly better than red ones. There is a lot of high-quality research, going back decades, showing this to be the case, for just two examples see https://tinyurl.com/hgtpxs2 (UMTRI) and https://tinyurl.com/ztqc7pw (SAE). There's the practical crash-data study NHTSA did in 2009, validating that research. Every other civilized country and most developing countries have required yellow for many years. Really, NHTSA should sunset the allowance for red rear turn signals, not with a tentative half-step like this NCAP proposal, but decisively and finally, for all vehicles starting from whatever effective date.
I don't seem alone in these views; please see https://tinyurl.com/gpaprb3 and https://tinyurl.com/jb9peta and https://tinyurl.com/htw9qaq and (closer to NHTSA's home) https://tinyurl.com/z6zgl6x and comments at https://tinyurl.com/goe2yq2 .
Thank you for the opportunity to provide my perspectives, for whatever they might be worth in NHTSA's process.
DCCarGeek on Oppositelock for finding the above comment from Karl.