I heard something similar up here, but apparently the way the law is worded, they use the word "alternating". Someone fought it and won as alternating was interpretated to mean left to right (ds to ps)
yeah, its definite down here. like flashing is flashing, no if, ands, or buts. In the few times I was told was in a defensive driving course taken for the discount and from someone who actually recieved a ticked for it