Forge only mod that adds dozens of traffic signs - including customizable direction signs, traffic lights and stuff for you to build more realistic roads. As of 0.0.1, this mod is only available in alpha version.
Items and blocks
Road signs
As of 0.0.2, URSS adds a variety of French road signs : danger, prohibitory, mandatory, information, and customizable direction signs : set your own town and city signs with your own road markers.
Road signs are blocks that can be placed anywhere, and can be placed on top of poles (basically similar to iron bars)
The majority of the signs can be set in different sizes : large, or small (upper or lower part of block).
Traffic lights
URSS adds some traffic lights : blinking single traffic light and blinking 2-light traffic light (for signaling railways for example), and classic 3-light traffic lights (2 modes for 2 ways, alternating. Click with hammer to change mode).
Crafting
As of 0.0.2, there is no recipe for blocks and items. Thus, this mod can only be used in creative mod. Recipes are planned to be added in a future version.