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Volleyball Interchanges

Started by Haljackey, November 26, 2011, 01:49:18 PM

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Section 13: Volleyball Interchanges

The volleyball interchange is also known as a 3-level diamond or split-level diamond. All turning motions are handled in an intermediate square structure connecting the eight ramps. Turning traffic travels around the square in the same direction as a roundabout in that country. Through traffic can proceed on either intersecting road without stopping.

Here is an example. Suppose you live in a right-hand driving nation, like U.S.A., and want to exit northbound on the thick black ramp of the above image. To go east, simply take the blue ramp: a simple right turn. To go west however, you would take the green route, which involves merging and crossing other traffic!

Advantages of the volleyball interchange include the ability to locate in it a narrow space along the two rights of way: more capacity than a diamond, and less space than a full cloverleaf. The volleyball's disadvantages however include a large number of bridges and low capacity compared to more directional interchanges. Because of the above reasons, Volleyball Interchanges are rare.

13.1: Standard Volleyball Interchange

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Section 13.1: Basic Volleyball Interchange (Created by Terring7)

For this tutorial, we're going to build an avenue -  R.H.W.-4 interchange. Tutorials for extra variations are coming soon. First, build the R.H.W.-4 and the avenue as the picture shows.

With the one-ways, build the central roundabout. There should be a 5 tiles gap between the one-way and the avenue, as you can see with the red dots. Same with the R.H.W.-4. You'll end up with 4 5x5 squares. But which is the best route to drag the one-way? The roundabout should be clockwise if you have a Left Hand Driving game. If you have a Right Hand Driving game, make the roundabout anti-clockwise.

Drag the one-ways with the right direction at least 1 tile from the crossing (brown dots).

Time to build the avenue ramps. We'll use one-ways again. In later tutorials, we'll use other variations. Build a 2 tiles straight one-way (red dots) and a diagonal to the avenue. The avenue - one-ways intersections will be 6 tiles (purple dots) away from the roundabout.

By using Fl.U.P.s, built one-ways underpasses under the R.H.W.-4. Make sure that the exits and the entrances were added in the right direction. We can use one-way overpasses as well, while the underpasses will make your interchange more elegant.

Remove the flat avenue and make in elevated, to built an avenue overpass.

Time to connect the highway with the interchange. This is tricky, so be careful. Add R.W.H.-4 started pieces at least one tile (green dot) away from the one-ways crossing. Make sure that the arrows of those pieces looks in the right direction (yellow arrows).

Drag the one-way for only 1 tile and then drag the R.H.W.-4 to build a connection.

The speed of the cars in the highway will be larger than the speed of the cars in the avenue, so they need a smoother ramp. Build smooth R.W.H.-4 corners as you can see in the picture.

Connect the ramp with the highway by using R.H.W.-6/Dual R.H.W.-4 Splitter Ramp (5x3). Use the R.H.W.-4 fillers to build the ramps. The highway itself looks a little messy. Don't worry, we'll fix it.

In the in-the-interchange side of the highway, remove some R.H.W.-6 parts and replace them with R.H.W.-4. Be careful, don't remove the parts that are too close to the ramps or the underpasses.

As about the other side, make a 3 tiles gap (blue dots).

Built a R.H.W.-4 to R.H.W.-6 transition. A good idea is to use a nice one from the "cosmetic pieces".

Sit back and enjoy :thumbsup: