Actually you can do this all in the Terrain editor without going any where or using another program other then Bryce.. Make your Terrain then duplicate your Terrain then on the terrain that is duplicated go into the Terrain editor and then Draw your roads where you want them..Then go back into your scene and grab the First terrain and make that terrain a liitle lower then the Duplicated one and Texture it your road color and Texture the other grass color then group both terrains and LOCK...