The W&OD (formally, the Washington and Old Dominion Railroad Regional Park) is one of the best-known recreational and commuting trails in Northern Virginia. The park stretches 45 miles from Arlington to Purcellville and is typically 100 feet wide. As Northern Virginia’s population has grown, and with the increasing popularity of outdoor recreation and bicycle commuting, the trail has become more crowded – especially in towns and urban areas, and especially during peak times such as rush hour and pleasant weekends.