No, what will happen will be a more dispersed form of pollution. More roads means that pollution will be spread about a bit, be diluted as it were. If cars pollute and the pollution is substantial, then it must be dealt with efficiently, and in the long-term at that. Building more roads is but a flimsy cosmetic approach to solving what is, at heart, a much deeper problem. Well, apart from simple ownership, one point hinted at by Mrs Rich is that of economical advantage.
Quicker traffic means more efficient trade.
This connects up to that well-worn tenet that unending economic growth is a good thing to be strived for. More trade means we can make, sell and buy more new things. More efficient trade means we consumers can purchase more and more goods. And the more things we can buy, the happier we shall all become praise be. If we amass things, the latest new things with their strongly projected desirability, then all shall be well.