This is the next tutorial in the blog about how to use the new feature for laying roads, introduced in SCARM v. 0.9.24. The article will give you ideas about how to work with the roads in order to make custom intersections, junctions and markings.
In the real world, the crossings and intersections may look in many different ways, depending of the surrounding environment and infrastructure needs. If you want to make custom crossings in SCARM, you can do that by using of several road sections that are connected and overlapped to make the needed shapes. The unwanted connection arrows may be plugged up with Road End pieces and additional markings can be created with the help of the figures. See the examples of custom crossings showed here and download the SCARM project files from the links below.
This junction is created by 3 IS Adapters and 3 identical curved pieces at 60 degrees.
To make the junction, put one IS Adapter and then a flex piece at 60 degrees. Copy and paste the IS Adapter, leaving the copy over the original. Now copy and paste the curved piece and attach the copy to the copied IS Adapter, but in opposite direction. Click over the IS Adapter and delete it – the copy will be removed and the original will stay. The junction will now look like the one below.
Now, using the same technique, place two IS adapters and one more copy over one of them, make a copy of the curved piece and attach it to the IS Adapter copy to complete the crossing. Remove the needless IS Adapter and use Road End pieces to tap the unwanted free end points.
Two roads, crossing at angle
This crossing is formed in the same way as Y-shaped junction, mentioned above.
The two large curved pieces are at 45 degrees and the short pieces are at 135 degrees. The pedestrian crossings are created with small rectangle figures and grouped together.
T-shaped traffic circle
The traffic circle is created with two identical curved sections at 180 degrees.
To make it, draw one semicircle section at 180 degrees, copy and paste it and attach the copy to the original. The approaches to the circle are made from overlapped curved pieces and the markings are drawn with polygon figures.
T-shaped junction on a main road
The main road has priority and there are two lanes in each direction – one for passing straight and another for turn to the crossing.
The main road is widened with the help of four Polygon figures, shaped as triangles and some of the surface markings are custom drawn, again with the figures.
And finally, one cloverleaf interchange with the roads in SCARM.
Only the strike out surface marking areas are drawn with the figures while all other sections are existing road pieces.
The next tutorial will show you how to make exact straight and curved road sections in SCARM.