I put a reflective flag sticker on my back window:
https://www.amazon.com/gp/product/B09Y96LDJ6/ref=ppx_yo_dt_b_asin_title_o08_s00?ie=UTF8&psc=1
https://www.amazon.com/gp/product/B09Y96LDJ6/ref=ppx_yo_dt_b_asin_title_o08_s00?ie=UTF8&psc=1
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