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Data Science Blog > R > Data Analysis on 2015 US Fatal Vehicle Accidents

Data Analysis on 2015 US Fatal Vehicle Accidents

Matthew SUN
Posted on Feb 1, 2018
The skills the author demoed here can be learned through taking Data Science with Machine Learning bootcamp with NYC Data Science Academy.

2015 US Fatal Vehicle Accidents Analysis

- Will self-driving technology reduce the fatal vehicle accidents?

Matthew Sun

Feb. 01, 2018

Introduction

There are over 5 millions of vehicle accidents reported in the US in 2015, according to data from National Highway Traffic Safety Administration (NHTSA). About 7% of them are fatal accidents. As the new technology of artificial intelligence going to mature in the next one or two decades, self-driving vehicles will become part of a normal life in human society. I am just wondering how this new technology can help reduce the car accidents on the road.

 

Data Overview

There is a dataset on the NHTSA website for 2015 fatal accident: ftp.nhtsa.dot.gov. It reports the fatal incidents in major US cities, counties and states. It also includes the longitude and latitude of the accidents so the data can be visualized on the map. The state, county and city are recorded in FIPS codes. After proper data cleaning and re-arrangement, the following data fields are used in the analysis.

  • State
  • Population
  • County
  • City
  • Longitude
  • Latitude
  • Month
  • Day
  • Hour
  • Time of Day
  • Day Week
  • Day of Week
  • Collision Manner
  • Road Function
  • Interstate
  • Junction
  • Trafficway
  • Vehicles Involved
  • Drunken
  • Road Departure
  • Weather

 

Geographical Analysis

Each fatal accident can be represented on the US geographical map as a blue circle dot, by its longitude and latitude number. By slicing the data according to the combination of chosen state, including all states as an option, the fatal accidents can be visually inspected on US map in each state.

The data can also be sliced by a timeframe of continuous number of hours ranging from one to 24. All the vehicle accident volumes on the map are aggregated into annual summation. The volume of the accidents can be differentiated by the intensity of blue color in each dot. By hovering the mouse over each dot, it will show a pop up message with the county name, a total number of vehicle accidents within the chosen timeframe and the state name.

Data Analysis on 2015 US Fatal Vehicle Accidents

 

Since the population of each state varies, the pure volume comparison is only one side of the story. The US basemap is at the same time, plotted as choropleth map according to the 2012 population density of each state.

Data Analysis on 2015 US Fatal Vehicle Accidents

The bar chart visualizes the fatal vehicle accidents volume against the accident density, which is normalized by the population of each state. Since the density number is extremely low, I used parts per 3 million for visualization comparison. The density of each state is plotted as black color, against a red line, which is national average density number.

From the bar chart, only South Carolina and Mississippi present both relative high volume and high density. The remaining majority of high volume states either align with or lower than the national average, after normalized with the population.

 

Cause Data Analysis

These three charts demonstrate the three major reasons that have caused the fatal accidents.

Data Analysis on 2015 US Fatal Vehicle Accidents

Road Departure away from the road is the major contributor towards the stationary collision and Head-on collision.

Drunken represented only 25% of stationary collision.

Surprisingly, the highest number of vehicle accidents, about two thirds of them are under clear weather condition, and one of the involving vehicles was in stationary position. Definitely weather is not the major reason why accidents happened.

 

Trend Data Analysis

The collision manner time distribution by the hour clearly shows the top three collision manner, which is stationary, angle and head-on. I will investigate these three categories in more details.

 

The next three area maps plot how each collision manner volume varies with the time during the day.

For stationary collision, the peak happened around 8:00 to 9:00pm. The second peak happened at midnight.

For angle collision manner, the highest peak happened between 3:00 ~ 6:00pm evening rush hour. The second peak between 10:00am to 12:00pm.

The head-on collision manner happened during morning and evening rush hours, namely between 6:00 to 8:00am, and between 2:00pm to 6:00pm.

 

Conclusion

The surprising findings from the analysis are that two thirds of the total fatal vehicle accidents happened in stationary manner under clear weather condition. During morning and evening rush hours, when the driving conditions are much more complicated, human beings actually did a much better job navigating through the busy traffic. This pattern fits well with self-driving technology, which can handle simple, repetitive tasks much more competently and effectively than human beings. I would expect the number of vehicle fatal accidents dramatically reduced with the advent of self-driving technology in the foreseeable future.

 

About Author

Matthew SUN

Matthew Sun has over 13 years of software development and analytics experiences in telecommunication and supply chain industry, using data analytics to help streamline and transform the business. He is always curious about new technology and believes in...
View all posts by Matthew SUN >

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