The traffic on Interstate 80 is typically at its worst near major cities—and I-80 runs pretty close to a lot of big cities in the U.S. Some areas with lots of traffic to watch out for include:
New York is notorious for being one of the worst cities for traffic in the United States, so you’ll need to drive carefully if you’re planning to use Interstate 80 in that area! That said, there’s also a large section of I-80 through the western United States that has very little traffic—so if you’re driving there, you’ll probably find it smooth sailing.