Hi Suhail,
I tried mailing you a file with the SITE Ground Plane set to a certain material which wouldn't show up good enough while rendering the same. But the file was too heavy for the mail.
I'll quickly list down the Material Settings used for the TAR Road in the project. Try and help me with the right combination of Material Colour and Transparency to get a finer finish while rendering the same. Also note that the rendered view in Plan comes out perfect Black, whereas the same comes patchy in any other view.
The Material is ASPHALT, STANDARD, WET from SITE folder in ACCURENDER Material Library. In the Material Editor Under MAIN, BASE Colour is set to R-50,G-54,B-50 & Reflective Finish - 0.343 & Luminance - 0.00 and rest are unticked. Transparency is set to 0.00 & Index of Refraction - 1.00