how can i set a friction to my road?
i use a7 and ode

you can c_trace and get the models name then use that, or use SCAN_TEXTURE with the c_trace and get the models texture and use that

i use a7 ode physic engine and want to set friction on a road model
but what i must to do?
i must set it as a physic object?how?

when i set my road to physic which type i must set it PH_BOX or PH_POLY

why do you want to put physics on your road model ? it should only be applied to moving objects

use PH_STATIC and PH_POLY