This tutorial demonstrates how to create several types of intersections.
You will create two basic types of intersections, which differ in how the intersecting road crowns are blended:
- In a peer road intersection, the crowns of both roads are maintained. The primary road centerline profile is maintained, and a locked PVI is created on the secondary road centerline profile where it intersects with the primary road centerline. The pavement of both roads is blended into the curb returns.
- In a primary road intersection, the primary road crown is maintained. The primary road centerline profile is maintained, and a locked PVI is created on the secondary road centerline profile where it intersects with the primary road centerline. Two additional locked PVIs are created on the secondary road centerline profile at the primary road edges of pavement. The primary road cross-slope is maintained, and the secondary road pavement is blended from the primary road edges of pavement along the secondary road pavement edges.
You will also experiment with curb return widening parameters, which are used to create turn lanes.
For information on adding widening regions to offset alignments that are outside the intersection area, see the Adding a Widening to an Offset Alignment exercise.