Found this on my facebook page. The group is called 6mm wargaming and terrain. The group has a lot of nice tips for building terrain. Below is a a two lane highway. Simple and quick to build.
The asphalt is just 320 grit sandpaper split in two, making each two
lane about 19mm, which seemed fine. Based black, painted gray with a
"wet drybrush" and finally a light gray on top of that. Fine sand glued
on, drybrushed with cheap acrylics and finally some static and clump
Now no excuses for not having nice roads on the battle field.