The 13 US cities with the absolute worst traffic

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AP Photo/Jae C. Hong

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Congestion is getting worse every year in the United States.

In fact, the average US commuter spends 42 hours stuck in traffic a year, according to a report by the Texas Transportation Institute. Congestion is also a big reason why auto and tech companies are pouring money into everything from car-sharing to autonomous driving.

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.

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Here are the most congested cities in the US: