Thank you very much for your comments Guys.
And hello Greasy,
The road is made from display card, the type you get in Graphics or Art stores.
I then sprayed it with Automotive spray paint, first grey primer. then a black on the edge's but as a light over spray.
gives it a very speckeld look. then a light over spay of white. I then drew the yellow lines on with Yellow coloured pencil and drew the cracks on the road with black and grey coloured pencil high lighted with white and then smuged with my finger !
I would say its a case of trail and error, try it on some spare card first, the most important bit is getting the black over spray on the grey and not going to heavy......spray from a distance.
Hope that helps.
All the best
Barry.