This tutorial demonstrates how to create several types of junctions.
You will create two basic types of junctions, which differ in how the intersecting road crowns are blended:
- In a peer road junction, the crowns of both roads are maintained. The primary road centerline profile is maintained, and a locked VIP is created on the side road centerline profile where it intersects with the primary road centerline. The pavement of both roads is blended into the radius kerbs.
- In a primary road junction, the primary road crown is maintained. The primary road centerline profile is maintained, and a locked VIP is created on the side road centerline profile where it intersects with the primary road centerline. Two additional locked VIPs are created on the side road centerline profile at the primary road edges of pavement. The primary road cross-gradient is maintained, and the side road pavement is blended from the primary road edges of pavement along the side road pavement edges.
You will also experiment with radius kerb widening parameters, which are used to create turning lanes.
For information on adding widening regions to offset alignments that are outside the junction area, see the Adding a Widening to an Offset Alignment exercise.