Innovation

In 2004, Stanislovas Buteliauskas, a noted engineer and lecturer at the Department of Engineering Management of The General Jonas Žemaitis Military Academy of Lithuania  pioneered– and in 2008 patented – a completely new type of road junction (interchange) – the PINAVIA.

Advantages of the PINAVIA road junction:

  • High multi-directional capacity: the road junction is analogous to a highest category, four-level interchange;
  • Safety: traffic flows do not intersect; there is no need to change lanes; and constant speeds can be maintained;
  • Innovative transportation and urban management strategies: the use of the area within the center of the junction itself creates ideal conditions for the formation of new transportation and urban management strategies. Construction of the PINAVIA at the intersection of various types of roadways and metropolitan beltways or ring-roads allows:
    - the junction to be developed as a hub for passenger flows and parking facilities, as well as a new location, where different types of enterprises and jobs are created;
    - re-direction of substantial traffic flows towards metropolitan area beltways or ring-roads;
    - reduced traffic in the direction of city centers and improvements in public transportation without additional investment;
  • Environmental protection:the junction combats traffic congestion – the maintenance of constant speeds guarantees quick passage through the junction, reduced fuel consumption and lower fuel emissions. The junction is architecturally neutral – the junction’s overpasses can be built on the same level as the roadway;
  • Universality: the junction is suited for the intersection of three, four and even five roads; it can be constructed for roads of the same category, as well as for those, which differ; the junction is applicable for both driving on the right side of the road, as well as the left;
  • Most economical in its class:  provides the same functions as a four-level interchange at half the price of construction.

Drawbacks

The road junction requires a large area of land. The external diameter (D) is determined by the projected speed. For example: when v = 40 km/h (25 mph), D = 153 m (500 ft); when v = 105 km/h (65 mph), D = 915 m (3000 ft).

However, this drawback may in fact be beneficial. The ability to easily enter and exit the area within the center of the junction itself may significantly increase its land value in comparison to its purchase price. Thus, construction of the junction has the potential to be profitable and the larger the land area, the larger its potential profitability.