4 ms·

I'm sure I understand why the stop light/intersections need to be there at all. Why can't the orange road pass over the red road on one side and then pass under

• JeffL 16y ago
  I think that would be a ton more expensive.
• jarek 16y ago
  Building overpasses isn't exactly cheap and the article said no bridge construction was necessary when putting this layout up. It can definitely be done if the traffic level warrants shelling out extra for not having two traffic lights, but once you're going for a three-level interchange there are a lot of existing designs out there already (and some don't have the entrance-exit weaving pattern).
• oozcitak 16y ago
  Additional bridges not only increase the cost of the interchange, but also its size. To allow for a 5 m vertical clearance for the bridge, you will also need approach and exit ramps. If your maximum allowed design slope is 5%, you will need 100 m ramps at each side of the bridge, increasing the size of the interchange by 200 m.