Primary focus of the PINAVIA

1. The objective of the unique, dual-level PINAVIA road junction is to reduce traffic congestion; increase transportation safety at the intersection of various roads; increase junction capacities; reduce junction construction costs; create the conditions for the rational utilization of land area within the junction; and reduce environmental pollution. Intersecting paths of traffic flows from various roadways pass one another at different levels at the PINAVIA road junction, while traffic can move safely at a constant speed. Prior to entry into the junction itself, each roadway intended for driving through the junction makes a large-radius right curve, passes the circular roadways of other roads via an overpass (or a tunnel), then joins the circular roadways and makes a large-radius left curve passing the entry roadway of the next road via another overpass (or a tunnel) and leaves the junction by turning right.   This provision must be applied to junctions of any number of road directions, but is sufficient for a junction of only three road directions


2. In a four-directional road junction, the roadway intended for driving through the junction forks in two behind the overpass (or tunnel) along which it runs. The right part of the roadway makes a large-radius curve and leads to the right, whereas the left part makes a large-radius left curve, continues along the nearest overpass (or tunnel) and proceeds towards the exit road beyond it.

3. In order to expand the junction’s application for use in junctions with roads in five or more directions, no fewer than two roadways must be built under each overpass (or tunnel) entering the junction, so that the roadways are built beyond the overpass (or tunnel) in such a manner that at least one roadway can fit between the right and left circular roadways, running along the nearest overpass (or tunnel).

4. In order to obtain a maximum increase in the radii of curvature of left-veering roadways and to ensure no decrease in radii throughout the junction, their centers are shifted forward along a roadway, beyond the geometrical center of the junction and to the left of it, without any increase in the junction’s diameter.

5. This invention’s combination of technical solutions allows for stable radii of curvature, no smaller than the smallest radii of curvature of the intersecting roads, for all roadways within the junction. This makes it possible for drivers to move safely in any direction within the junction at a constant speed that is no lower than that in intersecting roads.

6. A rational and easily comprehendible layout of traffic lanes – a combination of lanes and overpasses, which allows passage through the junction in any desired direction without changing lanes – greatly improves traffic safety. The direction of traffic in the lanes is compliant with basic traffic regulations: traffic in the right lane moves to the right, in the far left lane to the left, while the center lane is for moving directly forward. Depending on conditions, it is also possible to arrange traffic lanes in a different sequence.

7. Road junction construction costs are significantly reduced due to the fact that the junction is two-level with four short and narrow overpasses. The length of each overpass spans the width of only one roadway, not the complete geometrical width of the intersecting road.