In Civilization IV (G&K), I order my workers to build a road, then cancel so that they only put in one turn's worth of construction. I order them this way then move on to the next tile before actually completing the road. I do this all along the intended path until each intended tile only has one turn left of construction, then move back along the road, technically finishing in the shortest time possible. I do this because I don't have to pay for road until it's constructed, so this minimizes maintenance cost.
However, two turns before it's done, the game will not tell me accurately how many turns are needed to finish construction. The game does not tell me if there are one or two turns left to complete the road. I must remember whether or not there are one or two turns left to construct something with a worker. I don't do this with just roads either, but anything that takes a number of turns to construct via worker. I believe that this failure of the GUI is a bug. Is there a way to see whether or not there are one or two turns left to construct something?