Measurements by RIVM show that motorways again produced more noise in 2020 than the Directorate-General for Public Works and Water Management had calculated. The difference was 3 dB, the same as in 2019. Due to the coronavirus measures and the speed limit reduction, however, the noise levels along both motorways were lower in 2020 than in 2019. This is according to the 2021 Noise Monitor. The figures also show that, in 2020, so-called ‘quiet tyres’ still does not reduce noise produced by motorways in practice. The measurement and calculation of noise produced by railways did match.