I find road crews to be pretty cool to cyclists. I always get nice comments and waves going through construction zones.
It depends what is happening too though.
Last July coming South out of Fernie B.C. on the Crowsnest Highway, the road was blocked from a tree striking and killing a motorcyclist. The RCMP was on scene and blocked the road. Even though the road was completely clear, there was no way that they would let us through. I eventually asked one of the mounties if they had a problem with us cutting down the hillside through the brush out to the river and coming up on the other side of the wreck. They told us toknock ourselves out. We were on our mountain bikes so it was not a big deal.