In order to systematically improve the situation at level crossings, a programme for upgrading level crossings was launched in 2019 by selecting the most demanding level crossings to improve traffic safety, the conversion of which would bring the greatest benefit to society. Level crossings (Lentvaris — Vievis (38+ 855 km) and Kyviškės — Valčiūnai (18+ 419 km) on the freight route of the trans-European transport corridor IXB are selected for modernisation as one of the most risky and unsafe. Additional traffic organisation and traffic safety measures are needed to ensure the safety and throughput of the most risky priority level crossings. The aim of the project is to ensure safe traffic of trains, cars and pedestrians by installing the 2nd level traffic intersection Lentvaris — Vievis (38+ 855) and Kyviškės — Valčiūnai (18+ 419) crossings. During the implementation of the project, it is planned to legitimise the closing of the level crossings, install the 2nd level traffic intersection, construct the tunnel Lentvaris — Vievis (38+ 855) at the level crossing and the viaduct of cars Kyviškės — Valčiūnai (18+ 419) at the level crossing, remove one-level traffic intersection Lentvaris — Vievis (38+ 855) and Kyviškės — Valčiūnai (18+ 419) at the level crossings, dismantle the serviced APS equipment and crossing line, organise the access to new structures, update the associated systems and transfer new structures to the operator for operation. The installation of two-level intersections will improve the efficiency of traffic management, increase traffic safety, reduce the likelihood and number of accidents and fatalities and injuries that may occur at level crossings (compared to the previous year), increase capacity, reduce the speed limit for trains at level crossings, reduce the journey time by train (compared to the journey time with the current speed limit). If one level intersection is eliminated, the expected and positive environmental effect is that if there is no need to slow down trains before level crossings and to accelerate, the passing of a level crossing will lead to lower CO2 emissions.