Is it better than the old highway? Yes. The two biggest improvements are the third harbor tunnel and the (slightly more) simplified exit signage and ramps. The improvement in the aboveground appearance of the city is nice, but in the big picture not as important to the city and definitely not worth the cost.
Did it cure the traffic problem? No - It was designed 20 years ago with no plan for 20 years of growth. Oh, and it has leaks. And when the fans aren't working you're trapped in a tunnel with the exhaust of thousands of cars.
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