When I got to Olivers Hill - not sure exactly what time it was, but I set out from south end of City Rd at 6:15 and took about 4 hr 30 or 4hr 40 to get to Sorrento, including some stopping time between Olivers' Hill and Sorrento (hadn't stopped at all prior to Olivers Hill) - there were a couple of police cars at the top of the hill, but no ambo.... I'm guessing by that time it may have been a separate incident? It must have been around 8:30 by then. One of the cops was carrying a bike as I passed. As I approached Olivers' Hill, the riders in front of me were going around via the non-cyclists road.... either they were being directed that way, or it was just a long stream of cyclists following each other according to previous directions. When I reached the corner though, the marshall was directing us to the left.