There was a bridge, one lane was closed, the other lane was open. There were barrels with flashing orange light in the closed lane. They were redoing the bridge, one lane at a time. Those barrels were sitting on rebar. The bridge wasn't wide enough for them to put a concrete barrier between the good lane and the construction lane; just a lot of 10mph signs (or whatever the speed was), etc. It was dusk, I was on my 10-speed. And there was just enough room next to those barrels in the missing lane for a bike rider staying to the right side of the lane.
Funny thing about rebar - the way it's criss-crossed, it easily stops the wheels of a 10-speed from passing through. But, those holes are big enough for feet to go through.