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1. Interstate 10, United States of America (26 lanes)
The official name for this highway will be Interstate 10 or i-10 or some might call it Katy Freeway. It was built in the 1960s and at the start, this highway only has 6 to 8 lanes before the plan to expand it even more so that it will have the capacity of 200,000 vehicles in one day. This resulted in the addition of another 8 lanes making it 16.