Metro Washington DC is one of the most heavily congested regions for automobile traffic in the nation, as is shown consistently in various national transportation studies.

According to a transportation study by INRIX Inc. (a high tech telematics transportation company) metro Washington DC ranked #5 out of the top 10 worst traffic congested cities in the USA... the INRIX study also determined the peak weekly traffic period to be on Thursday afternoons between the hours of 5pm - 6pm.

According to another traffic study by the Texas Transportation Institute, the TTI ranked metro Washington DC #9 out of the top 20 most congested cities as measured by the number of hours commuters endured in extra travel time during rush hour traffic... the TTI determined metro Washington DC residents waste approx. an extra 58 hours per year traveling in local rush-hour traffic.

An analysis of search data from Overture.com has shown the search term "Washington DC traffic" ranked #11 out of the top 100 most requested US metro traffic search queries across the Overture network.

In a recent Road Rage survey commissioned by AutoVantage, the survey found that Washington DC road rage is the 19th worst in the US as compared amongst a total of 25 major US cities.