I don't doubt it. It is quite a while ago so I don't fully recall the talk that my professor gave, but I don't believe he intended to mean adding lanes was useless, just that they didn't help with congestion of the particular roadway
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If adding lanes doesn't help you didn't add enough. People live in a city to do things and you need to enable that by preventing congestion.
i don't know how to afford the 50 more lanes that most cities need though. I suggest better transit.
Removing parts of the city to add more lanes will also help decreasing demand - it's a win-win!