(Lansing, MI)  --  Drivers may notice fewer orange barrels on the roads next year.  In fact, Michigan could see half its road construction budget disappear by 2012.  According to the Michigan Department of Transportation, its budget is expected to drop from one-point-four-billion-dollars this year to 626-million by 2012.  Officials are blaming a freefall in gas tax revenue over the last decade for the budget cuts.  The 2012 construction season could be the first road budget below the one-billion-dollar mark since the gas tax was raised in 1996.