I did and it was quite an experience. They think about 30,000km people turned out for it. It was absolutely mega. The organising wasn't the best, which made for a few traffic jams and accidents, but to be fair it would have been a hell event to put together. They only used one side of the freeway for the cyclists and the other side for buses to ferry people back and forth. So cyclists were riding up and back. There were 3 rides, a 65km, 30km and a 10km family ride. I was on the 65km and although pretty packed, everyone was setting a fair pace and there was room to overtake. Things got hectic though when the 65km people had completed half the loop and were riding back through the start on the 2nd half of the loop. This was also the time the 30km and the 10km were starting, so the 3 rides merged. There were lycra clad road racers in amongst mums and dads and 5 year olds. It was bedlam for about 1/4 of the distance and the pace was crawling sometimes. I rode past a few crashes, although how on earth there weren't more was suprising. Still, overall, something different. Good to see the freeway from a different vantage point. Still, if you were after a decent ride, it wasn't the time or place, but made for great people watching.