To retrace historic Highway 66 takes some doing. From Oklahoma City through New Mexico US 66 roughly parallels Interstate 40. Except that I 40 runs straight while US 66 wanders just north of I 40, then south. Where it is still in use for local traffic that means US 66 frequently crosses I 40 back and forth through a pair of underpasses. The temptation is to bypass the old road and stay on the 4 lane, but that would be cheating. We passed through a number of these little crossunders when we retraced Route 66 from Tulsa to Santa Fe in October of 2009.
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