most of the ones I know are listed.
out west: cunningham hwy at redbank plains rd, between swanbank and ripley exits in median , oz fuel exit , before fuel station after amberly on the way out.
north:
nundah tunnel either end, sandgate rd after hamilton rd(northbound), toombul rd interchange. gympie rd kedron outisde caravan place (usually tucked BETWEEN the 4wds!)
between anzac ave and boundary rd M1 burpengary.
carseldine in the 80zone coming in off the freeway.
theres more of them I see daily in my travels but those are teh ones I remember.