I was alerted by Nate Rathjen of an archive of news footage from a Roanoke TV station from 1951-71 that was donated to UVa. There are thousands of clips which cover a lot of sports and stuff from the Civil Rights movement. But it also had stories that involved roads directly or stories where roads were shown in some way. After looking through the titles I saved the links to about 75 of them.
In this post I present links they had related to highway openings. Most are silent but anchor scripts are available for most of them underneath the video windows...
http://search.lib.virginia.edu/catalog/uva-lib:2355066 and http://search.lib.virginia.edu/catalog/uva-lib:2355068 discusses I-581 and its projected traffic
I-581 groundbreaking - http://search.lib.virginia.edu/catalog/uva-lib:2313207
I-581 drive around what is now VA 101 - http://search.lib.virginia.edu/catalog/uva-lib:2255181
I-581 drive all around the VA 24 interchange - http://search.lib.virginia.edu/catalog/uva-lib:2355223
I-85 opening (terrific shield at very end) - http://search.lib.virginia.edu/catalog/uva-lib:2251754
1960 opening I-81 at Buchanan - http://search.lib.virginia.edu/catalog/uva-lib:2219366
I-81 opening 52 mile segment in SW Virginia - http://search.lib.virginia.edu/catalog/uva-lib:2396467
I-81 opens Christiansburg to Newbern - http://search.lib.virginia.edu/catalog/uva-lib:2252212
I-81 opens in New Market - http://search.lib.virginia.edu/catalog/uva-lib:2220524
Bedford Bypass (signed as VA 297 first!) right before it opened - http://search.lib.virginia.edu/catalog/uva-lib:2355238
VA 419 opening drive around US 221 - http://search.lib.virginia.edu/catalog/uva-lib:2355368
VA 419 opening drive from 460 to I-81 - http://search.lib.virginia.edu/catalog/uva-lib:2214775
Enjoy!