I use Adobe Illustrator. The "layers" feature allows creating a layer of "black roads" traced from the Google map on the layer below. These "black roads" can be copied to a layer above and made white and thinner. This produces roads with two edges and all intersections.
Correl Draw has a feature that produces a two-edged road on a single layer.
Both these are fairly expensive software packages used by graphic artists. However, older versions can be found on eBay much cheaper.
The disadvantage I've found with these software is that with all the available features, maps can become pretty complicated and therefore take longer to produce. This, of course is not a software problem.