This maintains the traffic flow of roundabouts without disrupting the highway and is a highly efficient way of creating a city entrance. These additions make the interchange function similar to a roundabout, without any intersections, meaning cars can travel through without ever stopping.
They’ll also need their slip roads to diverge into two, one heading left and one heading right. To construct this interchange, players will need two overhead roads, each being one-way.
Constructing this interchange will be difficult and expensive, as it essentially duplicates parts of the original. By far the most complex city entrance, the Double Diamond interchange combines the best qualities of the regular diamond interchange and the extended roundabout to create one formidable piece of infrastructure.
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