Having lived in Pittsburgh, they've had color designated routes since I can remember over 40 years ago. My grandfather was a truck driver. It was like a primitive interstate system of the best route to take to another major city. With the advent of freeways, they essentially became the detours if you didn't take the freeway. It sounds like they've taken the elements of that system and turned it into an official detour system.
For I am persuaded, that neither death, nor life, nor angels, nor principalities, nor powers, nor things present, nor things to come, Nor height, nor depth, nor any other creature, shall be able to separate us from the love of God, which is in Christ Jesus our Lord.