By Tim Jimenez

By Tim Jimenez

PHILADELPHIA (CBS) — A new study of commute times shows the average Philadelphia driver spends nearly three days a year stuck in traffic.

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The navigation company TomTom released its annual Traffic Index report, measuring the impact traffic congestion has on over 200 cities around the world.

According to the report, Philadelphia’s traffic congestion is ranked 99 worldwide — and it’s the 20th worst city in the United States for the amount of time drivers spend stuck in traffic.

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TomTom says the normal 30 minute commute is extended by 18 minutes in Philadelphia

Not surprisingly, the index says that evening rush hour is the most congested time of day on the roads. If you have to drive during rush hour, TomTom says expect to double the time spent in the car stuck in traffic on average.

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The most congested day of the year in Philadelphia in 2014? Tuesday, January 21.