Thanks! On the website there are several different options, from a single piece of road to a rather large section. However, what is not shown in that picture is that the gap between the modular parts, which is clearly visible in the picture, is pretty much identical to the gap between the other bricks. As long as you keep half a millimeter distance between the parts and fill with glue, that should give you a good continuity in the surface.
Of course, if you want to keep it modular even after the painting, you can't do that ^^
cheers
Jack