On the Cunningham h'way where it drops to 80 just before the merge onto the ippy motorway, there's sometimes a cop with a radar there. Most usually on a friday arvo or a saturday.
Come to think of it, most places where it drops to 80... Ippy m'way near riverview just before the warrego exit, i've seen a marked car or bike hiding behind the big wooden fence, where riverview merges on. Also the Logan m'way where it drops to 80 around wacol area.
In Raceview, i've seen one on Cascade St, just before you hit whitehill rd as you come over the slight hill near the retirement village. And sometimes on Whitehill Rd itself around the Cascade st intersection.... (close to home)