​Speaking of traffic ... Megan McArdle, former Economist now at The Atlantic, is the latest to take up the issue of a hypothetical high-speed rail line between Dallas and Houston, which ain't on the government's to-do list but oh well it's fun to argue anyway. This morning she more or less makes the same argument many Friends of Unfair Park did when this came up last week: There's no need for such a rail line because there's, ya know, Southwest Airlines, for starters:Many of the people flying
