Nifty. A variation of this as an interchange with exit/on ramps and intersections or a cloverleaf would be neat. Would be great if some signage could be thrown on there as well.

Also noticed from the pic that overpass lanes appear to be 1/2 width of lanes going below. Might want to change the lane markings on one or resize some stuff.

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Barbequed Pixels?

Your friendly neighborhood Wings3D nut.
Also feel free to browse my freebies at ShareCG.
There might be something worth downloading.