At the risk of fanning more flames between here & the FIA rain light thread, I do kinda see a bit of an idea possibility that *could* be taken reasonably since the topic & discussion came up.
It has been mentioned about lights on the mirrors, but also the hurdles of then wiring/attaching/etc.
Instead of at the mirror, what about inexpensive yellow lights on the back of the car, triggered by the Flagtronics?
No, the driver obviously would not see their own light, so it doesn't help if you are on your own... but the main time flags are missed, are when you are in a fight. Maybe you won't miss one directly in your face, where you are focusing on.
If Flagtronics could just have a couple more wires for us to tie to, a $15 LED near the back of the car would alert everyone trailing to an issue as they come to a Caution Zone or FCY. Some pro series do this with their red lights, but we could differentiate from our rain lights. Keep in mind that I am a FV guy & we almost always have several cars around us. Heck, if we are given flexibility from Flagtronics for external lights... mount some small yellow LEDs on our beam towers to get attention.
Just a thought, since all this stuff is now a live discussion.
https://www.amazon.com/Partsam-Trailer-indicator-Waterproof-Installation/dp/B00YLWX0SC/ref=d_m_crc_dp_lf_d_t1_sccl_3_1/134-6541518-3723908?pd_rd_w=kB7qo&content-id=amzn1.sym.5d471845-5073-424b-b27b-c0676f48a016&pf_rd_p=5d471845-5073-424b-b27b-c0676f48a016&pf_rd_r=PB1VD10MAK49JSCHRTTF&pd_rd_wg =Q7oHb&pd_rd_r=cbf99c6a-8fd1-4d18-a9b8-a22ccfb4a25b&pd_rd_i=B00YLWX0SC&psc=1
https://i.ebayimg.com/images/g/1WwAA...AW/s-l1600.jpg