question for lo2k about tarmac colour with bumpmappin

i like the look of bump mapping but for me the surface is too bright,light, especially in the rain hence ive had to turn it off.
ive been trying to find what may possible effect the colour of the track surface when bump mapping is on, ive tried editing the following, both in the maps folder of gp4 and in the cars.wad but have had no sussess.
TARGREY3.JAM
TARBUMP3.JAM
rd01.tga
rd01.tga
rd01.bmp

i was wondering if perhaps the track surface colour is included in the circuit.dat file, or perhaps the track.gp4 file, and then either bumpmapping applied to that base colour or tarmacmap if bumpmapping is off.

any ideas ?

Nope, i also searched for it, particulary to replace that greenish tint on some track portions, but i never found its source, sorry.

bugger