I know this has been mentioned here before, but this annoyed me so much I have to add it again. I was riding west along Anzac Highway between Morphett Road and Tapleys Hill Rd, sunday morning about 8.30.  I was riding about 10 metres or so behind another guy, who waved his hand behind him indicating there was a car in the bike lane.  But I could see there were no cars, but instead there were abou…