I understand your description of the situation, prathmann, but I'm having a hard time understanding how the flaggers in your case made that mistake.
Since long before I was born, there have been systems for flaggers to communicate to each other when it is clear for opposite-direction traffic to proceed, whether they can see each other, talk via radio, pass a baton with the last car in a platoon (your bike, in this instance), or whatever.
It sounds like you experienced serious negligence or incompetence, at least.
And +1 to Fargo. Be nice to the flaggers. It's hot (or cold, or wet, or something rotten) and dangerous out there and it's a good thing for all of us that they're on the job.
__________________
"What if we fail to stop the erosion of cities by automobiles?. . . In that case, we Americans will hardly need to ponder a mystery that has troubled men for millennia: What is the purpose of life? For us, the answer will be clear, established and for all practical purposes indisputable: The purpose of life is to produce and consume automobiles."
~Jane Jacobs, The Death and Life of Great American Cities