Translating relative to orientation with matrices

[FreakyT]

I'm working a script that builds a world and outputs a new VRML file. I'm just doing it in Vizard so I can take advantage of the easy-to-use matrix calculation. Or so I thought...

Anyway, I need to build a road out of components that are rotated, and then translated relative to their orientation. My code looks like this:

current_transform.preTrans(0, 120, 0)
current_transform.preEuler(current_area_curvature, 0, 0)

The idea is that I first rotate the object, and then push it forward in the correct direction. However, when I call

current_transform.getPosition()

I just get [0, 240, 0], [0, 360, 0], etc. Is there any way to move the object relative to its current orientation?