X3-Roads is a mod for creating flat and ramped roads. The mod comes with 52 parts.
X3-Signs is a mod for using different signs, which can be fully customized.
Make Wood & Leaves is a mod (or maybe a cheat?!) for adding a Coal-Reverse-Process to make Wood and Leaves out of Coal.
Better Vehicles is a mod with multiple improvements for vehicles (like crash prevention, path copy/paste and more) in Tier 3.