us-75 between 635 and downtown Dallas, TX. Since DFW has easily outgrown it's road infrastructure every 5 years, this relatively newly built freeway is usually jam packed. However, any day past 10 pm, obscenely high speeds can be enjoyed as there is less traffic. Also, since the freeway is almost entirely below ground… » 12/07/12 12:49pm 12/07/12 12:49pm