How to consider Electric and Hybrid Electric vehicles in CNOSSOS-EU predicting method?

Electric and hybrid-electric vehicles are often referred to as quiet vehicles, comparatively to conventional internal combustion engine vehicles. At first, these new vehicle types were mainly developed for urban situations for their qualities concerning air pollution reduction, but due to the improvement of their electric range, they can also be encountered on national road networks. The electric and hybrid powertrain technologies are mostly employed on light vehicles, but a more recent breakthrough of electro-mobility can also be observed in heavier vehicles, such as delivery trucks or buses. In the framework of the project FOREVER, supported within the CEDR-TRRP programme and which primarily aims to provide data and information on the potential future noise impacts of electric vehicles on national roads, noise emission levels from several electric and hybrid-electric vehicles have been investigated. Measurements carried out on an experimental test track covered with dense asphalt concrete included microphones at the standard position (distance 7.5 m and height 1.2 m) and a wide range of driving conditions (constant speed, acceleration, deceleration and braking) and vehicle speeds. The dataset has been completed with results already available by project partners. Global and frequency dependent results have been compared with the sound emission model provided in CNOSSOS-EU. When appropriate, an adaptation of CNOSSOS-EU input data is proposed, as a first step towards the specification of light electric-powered vehicles in the European traffic noise predicting method.