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For me, it's the High Five interchange in Dallas, TX
Level I: US 75, an eight lane highway, four lanes going each way
Level II: The junction of the two six-lane frontage roads, each having three through lanes in each direction, left-turn lanes and turnarounds, and easy access to US 75 and I-635
Level III: I-635, ten regular lanes, five going each way, and four HOV lanes (two going each way) separated by barriers
Level IV and V: Direct connection ramps (two levels), eliminating the left exits of the modified cloverleaf