Missulena sp. Large mygalomorph spiders native to Australia (and one species in Chile) and considered potentially as dangerous as their relative the Sydney Funnelweb. A whole stack more photos here.
I saw something crossing the road, pulled over, and went back to check what it was. To my delight, it was this lovely specimen, probably a male judging by the red chelicerae and blue abdomen. Look at those lovely gigantic fangs and ferocious threat posture.
I directed traffic around him until I could get him off the road and take some photos. There’s some debate about why they’re called Mouse Spiders. There was a belief they dug deep burrows like mice, or perhaps ate mice, or the fact the females are large enough to resemble mice. The latter makes sense - compare to the less-well-known Australian Cat Spider, St Bernard Spider, and F***ing Ginormous Spiders.