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Compact SPUI Underpass

Compact Single Point Urban Interchange (SPUI) Underpass by Certified paint huffer

Overpass version made by me is available here

Elevated highway (6m) and Elevated arterial (-3m)

Elevated highway is at 9m over the junction to avoid traffic light/street lamp clipping.

Intersection should be pretty much 100% symmetrical, as can be seen from the grid overlay from asset editor.

Uses default (4u=32m) highway spacing

The intersection will work without TMPE, just not that well (mainly due to vanilla lane arrows causing forbidden u-turns, left turns).

Screenshots show the lane configuration for TMPE and traffic light configuration.

There is a single 3-phase traffic light for all left turn movements. Right turns on/off the arterial are not signalized.

Make sure to apply TMPE "enter blocked intersection" to the intersections on both sides of the central junction (screenshot 2). This greatly increases intersection capacity

Second to last screenshot shows the location of the 2 yield signs that are required for the intersection to work properly.

Ramps can also be upgraded to the 4-Lane heavy road from Network Extensions 2 to eliminate the need for the yield sign (last screenshot)