[Inkscape-user] Drawing streets

Hi,

I'm currently drawing a map, and I'm stuck with on how to draw the streets properly. The streets should consist of parallel lines with a defined fill color and a somewhat darker stroke color. I already read what Tavmjong wrote in his book:

http://tavmjong.free.fr/INKSCAPE/MANUAL/html/Paths-Creating.html#Paths-Bezie...

Basically, I understand the approach and got it to work drawing one comparatively simple stroke, but how do I get the lines being exactly parallel and smooth? I only manage to get it right with a lot of tweaking, but this way too time-consuming when I want to draw an entire map. Can anybody help?

TIA,

Claus