It's obviously not an issue for me as I plan to run out Hwy 90 to Big Bend NP in a couple of weeks and come back on I10, but if I10 looks scary to them then Hwy 90 would really concern them. When my wife and I attended Texas Tech in Lubbock, she had a roommate from Massachusetts one semester. We took her home to San Antonio one holiday and the 30 miles between towns with no vehicle traffic freaked her out. BTW there's not enough traffic on I10 in that area to be a concern, but you've got it right, deserthawk, there's a lot of great things to see out there.