Painting the bridge road, which is concrete (cement and gravel).
I chose to use the same dark grey, for the bridge framework, for the gravel.
My attempt to evenly splatter the paint, failed. So I improvised, and used the dry-brush technique of dabbing paint with a large artist brush. Dabbed
dark grey in the light areas and light
cement grey in the darker areas. Then did the same all over with a fine paint brush. Eventually I reached a point where I was satisfied with the restults.
Had a difficult time painting the road surface in the span.
The edges of the actual bridge and span are protected with a metal strip (painted here with silver colour).
Masked the road for traffic lines. Also added small palstic rectangles, painted yellow, for centre line reflectors.
Then I had a little play with the 1/74 (OO guage) scale cars.
Basically, and appearance wise, the bridge is complete. Still to do, is the swing gates, pulley cable system, and span hut electronics.
Of course the rest of the diorama is yet to be built, and will continue to do so on this thread. Hopefully you will be following.
Ha ha ha. The driver in a red car. After driving red for a long time, one becomes red blind. 
