Building new houses in urban areas is often hindered by the presence of road traffic noise. To build in these areas demands façades with sufficient sound insulation which can be difficult at low frequencies. This means that low frequency sound (LFS) from road traffic might be disturbing especially in the case of heavy vehicles. An important factor for the disturbance is the occurrence of audible passages depending partly on the traffic itself (distance, proportion of heavy vehicles, driving speed), the sound insulation of the façade, and the background noise inside the dwelling. Regulations are mostly based on A-weighted equivalent or maximum levels in the frequency range above 100 Hz. However, the audible events might be dominated by low frequencies including below 100 Hz. To investigate this an auralisation model including sound emission from heavy vehicles is combined with a propagation model. A loudspeaker array exposes the window of the Chalmers Living Room Lab to create realistic indoor sound environments. The paper presents the approach together with first results from a listening study focusing on the influence of source distance and façade sound insulation on the subjective response of listeners.