Determination of the noise reduction potential at bus stops through the use of hybrid and electric buses

To investigate the noise reduction potential of electric buses at bus stops, extensive microphone measurements were conducted during the stopping process of IC powered, hybrid, and all-electric buses. A number of 18 microphones were placed along the roadway at heights of 1.2 m, 3 m, and 4.5 m. The distance between the mics in the direction of travel was 6 m in each case. In the course of the measurement, 3 bus types were measured. More than 200 measurements were performed in total. The stopping maneuvers consisted of decelerating from 30 km/h and 50 km/h, staying at a fixed position, opening and closing doors, and accelerating to 30 km/h and 50 km/h, respectively. The maneuvers were performed in both directions of travel.