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Here in Houston, it would have to be US 59. I think it averages like upwards of 350K cars a day. I dare say it's the busiest in the entire state. Accidents abound. And rush hour? Forget about it.
Oh boy...I hate I-75 going through Kentucky and Ohio....semi trucks galore! Lots of bad drivers through there too.
Also in southern Kentucky, I-75 is rather hilly and busy.
As for my state of Pennsylvania, I imagine the busiest highways are in the Philadelphia area. But sw PA has a fair amount of traffic, especially on I-70.
In West Virginia, the I-64 region between Huntington and Charleston is rather busy. I-79 between Clarksburg and the Pennsylvania line is busy at times. If I'm not mistaken, the route 50 interchange at Clarksburg is the busiest in the state.
Illinois' would have to be the 4 expressways that draw into the circle interchange in downtown Chicago.
The Kennedy has 300,000 vehicles per day coming in from the north, the Eisenhower has 210,000 coming in from the west, the Stevenson has 200,000 coming in from the southwest, and the Dan Ryan has 230,000 coming in from the south.
The impressive factor is that these expressways are only 4 lanes in each direction except for the Dan Ryan which is 7 lanes in each direction. The Kennedy also has 2 reversible lanes that switch depending on traffic. The end result though is congestion at most hours of the day. 36 lanes total for 940,000 vehicles coming or going.
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