Blue Highways

Blue Highways are the secondary subspace routes of the Highlands. Blue Highways are routes which do not have hypercable communication stations seeded along their route. Beacon stations are located farther apart and the Department of Roads does not have as many gravitational weather stations located along the route. This makes travelling along the Blue Highways marginally more dangerous than along the Major routes. Travel is also generally slower. This is reflected in the subspace quality factor. Blue Highways generally have had less spatial stabilization. Portal Gates generally tend to be located outside the 100 diameter limit, in orbit around the stellar primary. This is less convenient.
Waystations are also fewer and farther between. A greater majority of travel along the Blue Highways consists of commercial traffic. Hypertrains do not run along these routes, so most passenger traffic goes by hyperbus, a much less comfortable mode of travel. It also much slower than hypertrain travel as there are stop overs every few days at the waystations that do exists.
Most cartage goes by hyperlorries.
The lack of hypercable means that information travels no faster than the Courier vessels of the Grand Postal System. Worlds on the Blue Highways are often thought of as a little behind the times by the inhabitants of the  population centers on the Major Routes. The Church tends to be fairly strong on these worlds, its clerics and orders often receiving news via the Church's own couriers before it is delivered by the Post.
Many religious orders and lay organizations provide both help to travelers and relief to natives.
The Shelta, itinerant trader/technicians travel the Blue Highways in their caravans of hypershuttles. Most are devout sons and daughters of the Church, though often accused of having odd interpretations of some of the commandments (most especially the sixth and seventh,) on worlds where their travelling lifestyle is looked on with suspicion. On many worlds their talents with machinery and technology are welcomed. They often seem to have the right materials and design specs for hard to get spares and some seem to be almost able to talk to technology. They are often associated with the Grey Friars of the Renewal, who often seem to travel with the Shelta caravans, both seeing to their spiritual needs and smoothing over problems with locals. Along with hyperlorries and HUVs, they are a common sight on the Blue Highways.
Outside the Highlands almost every route could be considered a Blue Highway. Most of these routes are toll roads, either privately owned or short routes joining the worlds of a petty collection of worlds. Some few are extensions of the Grand Human Union, expanding into the Midlands.
Within the Highlands the Department of Roads in constantly upgrading existing Blue Highways to Major Routes, stringing hypercable stations along improved spacial structures in subspace. Likewise the Blue Highways themselves are extended to otherwise disconnected worlds, previously only open to traffic with hypershunting capability. Even so some worlds will never be connect via Blue Highways, and some that are will never get hypercable.