The 15 US cities with the absolute worst traffic

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traffic AP Photo/Jae C. Hong

Auto and tech companies are pouring money into car-sharing and autonomous driving as traffic becomes a bigger issue in cities.

It's such a problem that the average US commuter spends 42 hours stuck in traffic a year, according to a report by the Texas Transportation Institute .

TomTom, a navigation and mapping company, ranked US cities that have the most traffic congestion in its 2017 Traffic Index.

After collecting data over a nine-year time span, TomTom measured the extra travel time experienced by drivers over an entire year. TomTom assessed 189 cities overall and gave each a congestion score out of 100. Each percentage represents how much extra travel time it took on average to make any trip, anywhere in the city.

Here are the most congested cities in the US:

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1. But it's probably no surprise that Los Angeles is the most congested city at 45%, a 4% increase from last year.

1. But it's probably no surprise that Los Angeles is the most congested city at 45%, a 4% increase from last year.

2. San Francisco has a high traffic score at 39%, a 3% increase from 2016.

2. San Francisco has a high traffic score at 39%, a 3% increase from 2016.

3. New York actually barely edges out San Jose with a traffic score of 35%, a 2% increase from last year.

3. New York actually barely edges out San Jose with a traffic score of 35%, a 2% increase from last year.

4. Seattle received a traffic score of 34%, a 3% increase from the year prior.

4. Seattle received a traffic score of 34%, a 3% increase from the year prior.

5. San Jose got a traffic score of 32%, a 2% increase from 2016.

5. San Jose got a traffic score of 32%, a 2% increase from 2016.

6. Miami received a score of 30%, a 2% increase from the year prior.

6. Miami received a score of 30%, a 2% increase from the year prior.

7. Portland also received a traffic score of 29% overall, a 3% increase from the year prior. But Portland has a much higher concentration of traffic in the afternoon than Boston or Honolulu.

7. Portland also received a traffic score of 29% overall, a 3% increase from the year prior. But Portland has a much higher concentration of traffic in the afternoon than Boston or Honolulu.

8. Honolulu received a score of 29%. That's the same as Boston, but Honolulu has worse congestion in the morning. Honolulu's traffic score was the same in 2016.

8. Honolulu received a score of 29%. That's the same as Boston, but Honolulu has worse congestion in the morning. Honolulu's traffic score was the same in 2016.

9. Washington D.C. barely edged out Boston with a score of 29%, a 3% increase from the year prior.

9. Washington D.C. barely edged out Boston with a score of 29%, a 3% increase from the year prior.

10. Boston received a score of 28%, a 3% increase from the year prior.

10. Boston received a score of 28%, a 3% increase from the year prior.

11. San Diego had the same exact traffic score as Atlanta at 27%, also a 3% increase from 2016.

11. San Diego had the same exact traffic score as Atlanta at 27%, also a 3% increase from 2016.

12. Atlanta edged ahead of Baton Rouge with a score of 27%, also a 3% increase from the year prior.

12. Atlanta edged ahead of Baton Rouge with a score of 27%, also a 3% increase from the year prior.

13. Baton Rouge received a score of 26%. That's the same as Chicago, but the score was a 3% increase from 2016, showing congestion is becoming a bigger issue in the Louisiana city.

13. Baton Rouge received a score of 26%. That's the same as Chicago, but the score was a 3% increase from 2016, showing congestion is becoming a bigger issue in the Louisiana city.

14. Chicago got a score of 26%, the same as the year prior.

14. Chicago got a score of 26%, the same as the year prior.

15. Austin received a score of 25%, meaning it took commuters 25% more time to travel anywhere in the city. That's a 3% increase from 2016, showing traffic conditions have worsened.

15. Austin received a score of 25%, meaning it took commuters 25% more time to travel anywhere in the city. That's a 3% increase from 2016, showing traffic conditions have worsened.
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