666 actually started (or finished) down at the Mexican border not too far east of Tucson Arizona, and proceeded northwards through much of that state before crossing into New Mexico near Gallup and then continued to cross the Colorado border within a few kms of Four Corners. From the town of Cortez (Col) it then went north-west into Utah, but only for a short distance. All up about 800 km. - some spur !!!
In the 2005 Rand McNalley all of 666 is renumbered, some as 191 and some as 491 as in the picture above.
By an almost stranger than fiction twist, and without realising it when I made the original post, of all the places a foreigner could get in the US I had motored about 200 km of 666 back in 1982. We had visited the famous cliff dwellings at Mesa Verdi in southern Colorado, and after overnighting at Cortez visited Four corners before going south to Gallup on 666 and back to Albuquerque on route 66 (now 40) from where we had rented the car.
Here's three pix from that visit.
Four_corners.jpg 32.61K
6 downloadsMrs C and daughter doing their best to stand in four states at the same time on an early cold and windy morning even before the Navajo traders arrived. If this place was in Australia it would be beyond the black stump - perhaps even back of beyond.
Nashitti.jpg 31.77K
6 downloadsA small village on 666 with a name needing care in pronunciation.
Hi_way_666.jpg 31.29K
7 downloads666. Note the rented car (a Pontiac) had no front plate. In N.M. at that time no front plate was required - something I think peculiar to that state alone then, but now more common.
I'd easily be juvenile enough Andrew T
(Not to steal one, but to hang one on my wall for sure)
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666. Gazzza
and maybe you really shouldn't have that plate, it'll just bring you bad luck forever. Maybe you should just bring it along to the National this week so someone can take it off your hands. 
We don't want to see the Head Shedheads head spinning off now do we 
