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DC-Area Commuting 2009 vs. 2015 using shiny

Posted on Jun 25, 2017

For the past several years, I've noticed the commuting time increase due to worse congestion in the DC area. A news report coming out from WTOP (a  news radio station serving this area) earlier this year confirmed my observation. The report reviewed U.S. Census data for seven counties and cities in this region, and compared the percentages of drivers, public transit users and teleworkers, as well as the average commuting time in 2015 with those in 2009. The specific areas WTOP selected  included: D.C., Alexandria, VA; Arlington County, VA; Fairfax County, VA; Montgomery County, MD; Prince George's County, MD and Silver Spring, MD.

The following is a brief summary of the commuting patterns that data has displayed:

Longer average commuting time

 

The above graph shows that average commuters, drivers as well as public transit users, from both Maryland and Virginia suburbs spent more time going to work. The longest average commute was in Prince George's County at 36.5 minutes- up for more than 1 minute from 2009,  followed by Montgomery County at 34.5 minutes-up from 33 minutes in 2009. Even though Arlington County had the shortest average commute at about 28 minutes,  it's up for two minutes from in 2009. Based on my experience, I believe the average commuting time in 2017 is definitely up from that in 2015.

 

Lower Percentage of drivers

 

According to the census survey data, the percentages of people in all seven areas who drove to work have decreased. Fairfax county which claimed the highest percentage of drivers-a bit more than 81%,  saw a decrease of 3% in 2015 compared to 84% in 2009.  DC, with the lowest percentage of drivers, had less than 40 percent of workers who drove to work in 2015, more than 3% down from 43.5 percent in 2009.

 

Percentage of public transit users mostly stay flat

 

Surprisingly, the decreasing number of  drivers didn't translate into higher percentage of the public transit users. The percentage of commuters who are public transit users stayed relatively flat in most areas between 2009 and 2015, with one exception. DC which always report the highest percentage of public transit users, didn't register big increase in 2015 . Other areas such as Arlington County and Prince George’s County, only saw small declines or stayed flat. The only area that showed obvious rise-1%, is Fairfax County which had one of the lowest percentage of public transit users in the D.C. area — 9.8 percent.

 

Higher percentage of teleworkers

 

An interesting trend also emerged from the data: by 2015 more people in DC region said goodbye to morning commute because they worked from home. Fairfax county tied with Arlington county as the area with the highest percentage of teleworkers, 5.8%,   up from 4.5% and 4.8% in 2009 respectively. One exception is Prince George's County where the percentage of teleworkers in Prince George’s County was 2.6%, about the same as in 2009.

 

I created a shiny app based on the data and the above analysis. You can access it at https://maggiezou.shinyapps.io/DCcommute/

About Author

Maggie Zou

Maggie Zou got a masters' degree in Math education and has been teaching Math and science in local school district for the past ten years . She also works as an interpreter on the side for the governments...
View all posts by Maggie Zou >

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