The W&OD trail does contain many segments with dedicated on-trail lighting. Also, the trail’s close proximity to densely populated portions of Northern Virginia affords runners a good amount of ambient lighting. Nevertheless, the trail does pass through a variety of wooded sections of the Northern Virginia landscape where there is no light at all. Runners should always be equipped with the necessary reflective gear and personal lighting when using this trail.
The W&OD trail does contain many water fountains at regular intervals. However, these fountains are subject to seasonal restrictions. Also, given the trail’s long length, it is difficult to predict the availability of water—due to matters like construction and trail repairs—at any given time. Runners should always carry water (or sports drink) for longer workouts. Given the W&OD’s close proximity to many populated areas of Northern Virginia, runners should also carry money in case they wish to purchase water at any point.