"Most of the Mauna Kea access road below Hale Pohaku is open range, and the cows frequently cross the road. Dark colored cows are often invisible in darkness and/or fog. Use extreme caution and drive very slowly in this open range."

https://boingboing.net/2021/10/18/the-story-of-hawaiis-invis...

Cattle that are hard to see given the environment: https://boingboing.net/2021/10/18/the-story-of-hawaiis-invis... .