The paper deals with long range outdoor sound propagation predictions under range dependant complex environment using the parabolic equation approach (PE). New developments allowing to work beyond the classical limits of the PE method are presented: the reflection and multiple-reflections due to vertical obstacles using a complementary Kirchhoff approach, the integration of complex noise barriers effects by the help of a hybrid GFPE-BEM method (Green's Function Parabolic Equation - Boundary Element Method), the reference rotation principle applied to embankment-like geometries. Numerical examples of road traffic configurations illustrating such realistic combined effects are presented and compared to reference calculations as well as scale model measurements results.