Thanks for the link.In 1966 I drove 66 from Ca. to OK city.
Most was still 2 lane and through Arizona the pavement was different colors
depending on the crushed rock used in the asphalt mix.
There would reds,black even some yellow colors.
Driving the stretch Barstow to Needles the road just seemed to flow over the natural surface of the land.
It was like a "kids roller coaster". The first 4 lane I remember was west of Flagstaff for a few miles.
Then the road would be one way in either direction through town.
All the towns along the route from Ca. to New Mexico took you straight through the town.I think some
of the 4 lane was also built in the Texas panhandle.
I traveled that road several times over about 9 years and every time there was less of the 2 lane.
Lots of great memories.
Frank