One of the most dangerous jobs in America is working on or near a highway.  Road crews put their lives on the line when they step alongside traffic to repair roads, sewers and waterlines.        Other transportation crews jump into trucks in the most severe winter weather, to keep those roads clear for driving.          HenryCounty is poised to meet the challenge of ice and snow this winter season, with a stockpile of 3,000 tons of salt, and ten trucks that are ready to roll.