On 12/16/04 a city contractor filled a 48" wide trench across a city street that is a major bike route with 14" of wet concrete with the consistency of runny oatmeal. The wet concrete was perfectly smoothed to the surrounding concrete road. The crew put a narrow metal plate across the far left side of the trench and set orange cones at 12 foot intervals in front of the rest of the trench. A car was coming the other way. We did not see the metal plate or the wet concrete. We did see the car. My spouse was slightly ahead of me and rode straight ahead between the cones. I followed. My spouse suddenly catapulted over the bars and slammed to the payment. I had the "Oh No" second in which I realized something bad had happened to my spouse, that I had no idea what had happened and that whatever it was might happen to me -- before my bike was ripped out from under me and I also slammed into the hard concrete beyond the wet stuff. The front wheel of each bike was grabbed by the wet stuff and dropped to the hub. The bikes were covered in wet concrete and received a few scratches but were fine. I speared the concrete and broke my right collarbone and my left wrist. My spouse rolled and tumbled, wrenched her back and cut her check but broke nothing.