Images aren't materials. Images are textures. Save your image as (you MUST save it as this for it to work) RoadTex, and make it a PNG file. (MUST BE A PNG) What you do is go to your materials folder, right click and drag a material file and select copy here (in the same folder) and it will make a copy of that material. Now, re-name it to Road. Then open it in notepad. Erase everything in there, and put this in:
material RoadMat
{
technique
{
pass
{
cull_hardware none
cull_software none
texture_unit
{
texture RoadTex.png
}
}
}
}
Now go in-game. Go to object maker and load whatever you are putting this texture on. In the MATERIAL blank, put RoadMat and it will load, if you did everything above correctly.