Nope, I've never rode on an Interstate. I've crossed over quite a few....

Usually I try and route waaaaaay around metro areas, but there usually are parallel US Highways that I use, or better yet, plain old curvy State roads going in my direction.

Route 66 is a famous US Highway, I was on US 36 through Kansas, which used to be the major road from Indianapolis to Sacramento. US 3 in the Oklahoma panhandle is a calunk calunk culunk concrete highway I used.

There is more history found on the back roads than on the sterile & boring Interstates.

The majority of my rides are on two lanes.

However, during my week stay in Denver my friend drove us through your neck of the woods, to a 2 night concert at State Bridge, on the Colorado River. And I noticed regular bicycles on the interstate from Denver through Vail.

Apparently from the Rockies westward, where sometimes Interstates are the only way through a mountain pass or across a long stretch of desert, bicycles are allowed as a necessity. (That's what I heard anyway, check your local regulations.)

East of the Rockies, no Interstate highway access, but who needs them?