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:

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.

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

See the rest of the story at INSIDER