13% of Marylanders expected to travel for July Fourth weekend While some people were stocking up on burgers and sparklers for July Fourth celebrations Wednesday afternoon, Randy and Pat of Hagerstown were at Advance Auto Parts on Dual Highway browsing for tires and spark plugs. They were getting their van ready for a trip to Skyline Drive in Virginia, where they planned to spend the holiday weekend relaxing in the Blue Ridge Mountains and visiting a parent …