[rootusrootus]

> So infrequent, I don't think they even appear in the WA drivers handbook which is kind of shocking

They are definitely in the handbook. Couple different types, with pictures and diagrams, and written instructions.

[Jblx2]

Specifically, section 4.15, staring on page 126:

https://dol.wa.gov/driver-licenses-and-permits/driver-traini...