I was hit in the rear last night by another cyclist. I'm unsure who was to blame... 6pm, I was riding (here S>N) in commuter traffic. I was in secondary between flowing traffic and stationary parked cars with no gaps. I was planning to turn right. Instead of taking a primary position and holding up the traffic that was going in my direction, I slowed down, while constantly checking for oncoming traffic and from behind to look for an opportunity to make the turn. However, none came so I slowed to stop before the junction, but still in secondary with the intention of letting the traffic calm from the regulation of the lights further along. A cyclist, coming from behind, went straight into me. I had not seen him when I was looking back at the traffic so I don't know how close he had been. But I didn't come to an abrupt halt or anything, so its surprising he didn't see me - hiz vizzed up, etc. He must have seen me as he moaned that he was unsure what I was doing. I certainly didn't indicate, but I would have thought it was obvious from my slowing down and persintent checking over my shoulder that I would be turning. But maybe not? I don't think I made my intention clear, but I didn't come to an abrupt stop either. Should I have indicated? Could I have done something different?