Precision laser cut from 1/8" (3mm) MDF
This piece has an extra set of slots halfway through the corner where you can place an extra roadway support column. The piece works fine with one support column at each end, but it looks better with an extra one in the middle. If you choose not to use a middle support colum you can just fill those extra slots with wood putty.
Roadway support columns are sold separately. Some photos may show roadways sitting on support columns, this is for demonstration purposes only.