The incident serves as a reminder that Marine Corps Base Quantico is home to a large number of people who are very physically active and regularly use the trails, sidewalks and roads as a place to exercise. Safety on the roads requires the participation of all drivers, cyclists and pedestrians (runners are considered pedestrians because they are on foot). - The incident serves as a reminder that Marine Corps Base Quantico is home to a large number of people who are very physically active and regularly use the trails, sidewalks and roads as a place to exercise. Safety on the roads requires the participation of all drivers, cyclists and pedestrians (runners are considered pedestrians because they are on foot).