There is usual road tile (without lines), You can make your street wider. It is not a problem.
About walls. I'm sorry. I forget to rotate them! But now I can try to correct it
they look pretty good but i think you shouldn´t jsut copy and paste them. the street is to small. make it at least 3-4 tiles at width. you could make corners and vertical walls etc. for the walls. make it and you really deserve 5/5