As I reached the crest of the bridge, I noticed that traffic was banking up in two of the lanes heading into town. The second lane was blocked because a white van had rear ended a small hatchback (not surprising - white van drivers tend to be amongst the most reckless and aggressive drivers on our roads). Then, to my surprise, I found that slightly further on, the third lane was blocked by a three car pile up. None of the damage looked particularly severe - I couldn't even see any dents in any of the five cars involved. They appear to have been moving just fast enough to break a lot of glass and plastic - the road was carpeted in it.
Two blocked lanes was not a good thing. As I tried to take a photo of the scene (and failed, due to bigger vehicles blocking my view of the crashed cars), I watched the traffic rapidly grind to an almost halt all the way back to Victoria Road.
I don't know if the stopped police car was the cause of all that carnage, or whether it had stopped because of it. I can imagine people panicking when seeing a cop car up ahead and slamming on the anchors, and that causing some rear-end shunts further back down the line.
Whatever. My bike lane was clear from end to end. I clipped into my pedals and kept on moving, homeward bound.