I own a mountain bike but I refuse to ride it anywhere but on a few bicycle trails and only then weekdays during the day. Weekends when the weather is nice the trails are crowded and there are too many bicyclists racing.
Arlington's streets are a dangerous disgrace. They are covered with potholes and broken pavement. The street bike lanes are covered with sand and trash.
Please don't ride your bicycle on Arlington's streets. They are too dangerous.