The concept has been around a long time. In England, it means the lanes are wider and have hard shoulders. Slower vehicles are expected to pull over and let speeders pass.
http://en.wikipedia.org/wiki/Super_two
But in Texas, the concept has been refined. Especially in the Hill Country lanes tend to be narrow and mostly have no shoulders. Really hard on bicyclists. But now we’re getting smart; widen the lanes, put in an occasional passing lane, and you’ve got a Super-Two, Texas style!
http://onlinemanuals.txdot.gov/txdotmanuals/rdw/super_2_highways.htm
BTW: the frequent signs that read “Do Not Pass” don’t actually mean you can’t pass the sign. Just drive right on by. You might see an Aggie sitting there waiting for the sign to change. Go ahead and point and laugh…..
Texas 71 south of Llano to US 281 got the “Super Two” treatment in late 2013 to mid-2014, destroying a geocache in the process. But it’s a pretty drive and when the construction is finished, driving it will be much less frustrating.
Great view and easy park-n-grab! Magnetic, some swag, BYOP ; Super, too! Up, up, and under.