model (raster, vector, 2D, 3D, render, animate, simulate, ...)
Using Inkscape to create vector and raster describing street and some trees
Using 123D Design and Onshape to create traffic signal
After testing some features... I started final project drawings by making some sketches at first to determine some dimensions
Then I used inkscape to draw what I've in mind and reference to the calculations and designs that were in my imagiation.