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The Price of Anarchy for this class of games takes maximum value 4/3; this maximum is attained already for a simple network of two parallel links, known as Pigou's network. We improve upon the value 4/3 by means of Coordination Mechanisms.\n  We increase the latency functions of the edges in the network, i.e., if $\\ell_e(x)$ is the latency function of an edge $e$, we replace it by $\\hat{\\ell}_e(x)$ with $\\ell_e(x) \\le \\hat{\\ell}_e(x)$ for all $x$. Then an adversary fixes a demand rate as input. 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