Perfect Road Guides

Using Skye's Perfect Road Guides mod..

Cash cow starter city created using this mod, the square road tool, and low density roads. Intended to get back to back low density. Not sure if the problem is slight variations in terrain elevation or my use of the tool (SimCity's grid snap can be a little loose), but several of the sections in the screenshot here were not able to develop a second row of buildings. I'll try again next time and report back. Click image for larger version. 

UPDATE: Skye's subsequent '60 Sec Tip' on the matter has convinced me that I was probably not snapping roads correctly (and not a terrain issue). I now start drawing roads from the guide lines (not where those guidelines intersect the adjoining road), it appears to be much easier this way and I'm almost always 'in the green' this way. Also be sure to watch his video to learn how the mod works before using.