don't forget the "special circumstances" below:
when passing another subie who is stopped in the left turning lane at a light: circumstance A) you do not have window tint: i. windows closed: if safe you may exzibit wave by raising right hand to ear height between the two front seats so that parked subie will see. ii. windows open: if safe you may choose first option OR you may extend LEFT arm out window at a 15 degree DOWN angle with any combination of two or more fingers extended.
circumstance B) you DO have windows tinted: i. windows closed: driver discretion. ii. windows open: see A)ii.