GameObject doesn't apear on game tab

The road is well seen in Scene tab but while i switch to Game tab the road goes under my two images.
I was trying to play with Z axis but nothing helps.
Black image have Postion Z set to : 1
Red image have Postion Z set to : 0
Road have Postiong Z set to : 0

so why in Scene Tab black image goes under the road and at the top of the red image?
While in game tab black is on top of the red one and track is stretched and making as background ?

also why images height is higher in scene tab than in game tab ?

You have put a Mesh Renderer inside the Canvas which is a UI renderer.
Remove the Road from the Canvas and position it in front of the Camera with some forward offset since the camera has FOV.

I have made a quick video to help you out