Here’s something to think about the next time you’re stuck in traffic.

The GPS navigation technology company TomTom reports that Las Vegas, Nevada has the 19th worst traffic congestion among 53 major metropolitan areas in the U.S. The traffic index study, created by the leading mobile GPS navigation and mapping company in Europe, credits Sin City with a 21-percent congestion level, indicating that motorists spend 21 percent more time on Las Vegas roads than they would in a free-flowing traffic environment. In its report TomTom also said the traffic congestion in Las Vegas is at the worst on Thursday evening.

The study shows the average Las Vegas motorist will experience an 18-minute delay during peak periods, translating into drivers that have a daily 30-minute commute being stuck in traffic for 53 hours a year. The worst of the traffic congestion in Las Vegas occurs on streets, which have a 24-percent congestion level as compared with only 9-percent congestion on highways.

In the company’s fourth traffic study since 2011 TomTom compared traffic in 186 cities across six continents. The top five congested U.S. cities are Los Angeles, California; San Francisco, California; Honolulu, Hawaii; Seattle, Washington; and San Jose, California. Only four cities in the U.S., Honolulu; New Orleans, Louisiana; Pittsburgh, Pennsylvania; and Louisville, Kentucky, had decreased congestion since the previous study in 2013. The cities in the U.S. with the two lowest congestion indexes are Kansas City, Missouri and Indianapolis, Indiana.

The five worst areas for overall traffic congestion among cities in North and South America are Rio de Janeiro, Brazil; Mexico City; Sao Paulo, Brazil; Los Angeles; and Vancouver, Canada. The TomTom study ranked Las Vegas 28th in North and South America and also reports that congestion in Las Vegas is increasing.

Other traffic information about Las Vegas in the report includes:

Congestion for the Thursday-evening commute is almost 39 percent, the worst nationwide, barely edging out the Friday drive.

The easiest weekday commute is Monday evening with a congestion index of just over 30 percent.

The worst peak-hour period in Las Vegas is Wednesday morning with Monday morning being the easiest.

The traffic congestion in Las Vegas is roughly equal to Atlanta, Georgia; Boston, Massachusetts; Houston, Texas; and San Diego, California. In the Western part of the U.S., traffic congestion in Las Vegas is worse than Denver, Colorado; Riverside, California; Salt Lake City, Utah; and Phoenix, Arizona.

Las Vegas saw its worst congestion on Thursday, November 21, 2013 when nearly half an inch of rain was recorded at McCarran International Airport, the single biggest rainfall total for the year.

TomTom is headquartered in Amsterdam, North Holland.