GOING BACK TO FIGURE 2 - forgot to say in #3 to choose Center for where to place the stroke!

Onto Figure 4: Texturing!

1 - Re-open your PSD, and Ctrl-Click on the thumbnail of your roadway to select it (you should now see the crawling ants!)
2 - Select a  lightish grey color with a hint of a color (mine is on the orange-ish brown side) to be the color of your concrete or asphalt. Fill the roadway with that color.
3 - Double-click your layer style and change the color of the Outer Glow to match your road's color.
4 - Click the Paths tab - here's where it make life easier for texturing to use Paths - and Ctrl-Click on the thumb to make it active.
5 - Select>Modify>Contract - 2 pixels.
6 - Edit>Stroke - choose a yellow color you want for the middle lines and make it 2 pixels and choose Inside.
7 - Select>Modify>Expand - 2 pixels.
8 - Edit>Stroke - your yellow should still be there - 2 pixels, and choose Outside.
9 - Create new layers UNDER your roadway and make your textures you want - find images of rocks, whatever. I just started here with greens and browns and added noive, etc. I eventually pulled out images of rock-faces and went crazy with texturing.
10 - When you're finished - save your progress with all the layers as ANOTHER PSD so you can edit later - then Flatten the image and Save as a TIF for your Color map. DO NOT CLOSE YET!
11 - Click one step back in your History to unflatten the image: Change your roadway and Outer Glow back to BLACK, and make any other changes you want as well, Flatten the image and play with Levels or Curves or whatever to adjust the contrast to your liking and SAVE AS ANOTHER NAME for your Bump map.