Weathering steel, we used it for bridges all the time a few years ago, although it seems to have fallen out of favour recently. Asset owners liked it because you don't have to repaint it every few years (good for both reducing disruption and avoids having people work at height).
The patina can look quite nice (in my subjective opinion) but it's not particularly resistant to impact, and requires a thicker section size than painted steel.
Automotive application could certainly be... Interesting.