Jan 18, 2010 · China State nstruction Engineering (CSCE) needed to build a temporary road for a nstruction site it was worit on in Hong Kong, which required a three-year closure of a public road. It used AutoCAD Civil 3D to optimise the process. The new road was to angle down a steep, uneven slope, yet its gradient was required to be no more than one to ten, and in certain places ncrete blocks would need to support the outer edge. These would range from 1m to 10m in height.