Presentation comparing results of Switzerland’s NExUS study on electric vehicles and internal combustion engine vehicles with RD-ASEP Sound Expectation Model predictions. NExUS study objective was to compare EVs with ICE vehicles of the same consumer segment to better understand EV modelling. Key findings show overall sound levels of EVs and modern ICEs are close under constant speed, while ICE sound is higher under low-speed acceleration. RD-ASEP SEM predictions align closely with NExUS measurements for both accelerated and constant speed conditions.
Presentation on the Nord2000 noise model used in Sweden for road traffic noise mapping. Nord2000 uses five vehicle categories described by weight and number of axles, with 1/3 octave band frequency resolution from 25 to 10000 Hz. Two sources per vehicle category represent rolling and propulsion mechanisms. The model includes surface corrections based on Swedish CPX measurements, horizontal and vertical directivity patterns, and methods for deriving source sound power levels from field measurements using the propagation model with assumed omnidirectional sources.
Study identifying and prioritizing road traffic parameters that most strongly influence linear acoustic power levels and noise exposure using the European regulatory method CNOSSOS-FR in the Hauts-de-Seine department. Sensitivity calculations applied to 25 of 36 municipalities using E5 parameters, with population exposure counted using the median method. Analysis examines hourly traffic composition, pavement data from Renault sensors collected June 2024 to May 2026, and average speed data from departmental and national sources.
Policy briefing on road traffic noise as a health hazard and the opportunity for electric vehicles to reduce environmental noise pollution. Documents health impacts including hearing loss, cardiovascular disease, cognitive impairment, and sleep disruption, with particular vulnerability for infants, children, seniors, and people with pre-existing conditions. Addresses enhanced exterior sound systems in EVs that replicate combustion engine noise, undermining noise reduction benefits. Recommends regulating acoustic vehicle alerting systems for pedestrian safety while prohibiting sounds beyond public safety requirements, and prioritizing public health over commercial preferences.
Agenda for the 23rd session of the Task Force on Vehicles Sound on 20 October 2026. The session will cover adoption of the agenda and report of the 22nd session, exchange of information on national and international requirements including presentations on quiet communities and noise sensitivity analysis, cross-matrix comparison of sound traffic modelling approaches with presentations on noise modelling and CNOSSOS-FR parameters, any other business, and arrangement of the next meeting in February 2027.
Overview of rounding principles for calculations in models where results are used for further calculation. Recommends carrying full precision until the end and applying rounding only to final output. Identifies Round Half to Even as standard for modeling and statistics, and Round Half Up as used in UN Regulations. Advises matching output precision to input data uncertainty and not reporting more precision than input data warrants.
Task Force Data Analysis provides input to the Editing Task Force on three items. For vehicles with single gear ratios, remove brackets from text restricting acceleration to no more than 2.0 m/s and continue with adopted text for UN R51.04. Restructure Annex 7 paragraph 4.4. into subparagraphs for clarity. Rework paragraph 3.6.1. to define reference acceleration with v-t-e ratio and specify procedures for determining maximum reference acceleration. Add specification to factor x determination to prevent extreme results and harmonize its representation as either percentage or decimal value.