Put up your hand if you think you're safe riding at a nice 'safe' speed well below the speed limit on a freeway while in the left lane?? Put them down. You're WRONG!!! I was on the Westgate freeway the other night, in my cage. It was late and I was tired. Heading West, I just came out of the 80 zone after the bridge, but I had the cruise control engaged so was still at 80km/h. I was in the next to left lane but saw that the left lane was pretty much remaining at 80km/h while the other lanes had faster moving vehicles with some gaining on me directly behind, so I moved into the left lane. I was happy to sit on cruise in the left lane, with my brain disengaged as part of the apparently slower traffic. I noticed that cars up ahead started changing out of the lane and into the faster moving traffic - but I didn't think too much of it. Cars change lanes all the time... after half a dozen cars I noticed well up ahead a small single red weak brake light to the left of the left tyre track. In the dark and my distance I couldn't tell what vehicle it was, but my mind decided it was a car with the right tail light out and due to it's apparent size and strength, it seemed way way up ahead. I didn't register that I was gaining on the light - my brain was disengaged and I was happily cruising at 80km/h with no one behind me... then with something like 30 - 40m to go, something tugged at my mind about this light... with a start I realised that I was gaining on it at a rapid rate! Suddenly the vehicle loomed into my light throw and I spotted that it was a black motorcycle with a small weak rear light, with a rider wearing all black and riding much slower than me on the left of the left lane of a 100km/h freeway. WTF?! I was not alcohol addled and so was able to manage the situation and change lanes... but frankly, a more tired driver or one alcoholically influenced might not have realised the predicament until too late - with a tragic outcome for all concerned. In hindsight I can see this incident more clearly. The weak small light made the distance seem greater. The lack of visual perspective clues made and a tired brain made the distance seem greater lulling me into a false sense of security. In actual fact, the distance wasn't that great at all. Now layer over the top the fact that the rider created a strong differential speed by riding along slowly on a 100km/h freeway and the risk to the rider was pretty darn clear! I must have been bearing down on the rider at a scary rate but they hadn't even flinched. I would expect a proactive rider to move about in the lane, change lanes, flash their brake light, speed up or do something to address the risk coming up from behind... but this guy did nothing. Apart from the lesson for me the driver, I took several away as a roadcraft reminder for riders: DO NOT create a safety risk for yourself of a significant differential speed on a busy/main road or freeway. YOU might feel like you're managing your own personal risk by riding more slowly, but you have actually just created a major risk requiring all others to manage your slower speed. Keep an eye on your mirrors. Don't rely on other road users managing your safety for you. Everyone is out to get you. Here in endeth the sermon.