For noise by road traffic a distinction can be made in traffic
in rural areas and traffic in urban areas. For road traffic in
the urban areas no data are available yet to get an overview of
the extension of this source. For the rural areas only sound
levels around national motorways were available. The percentage
area around national motorways that is located within the 55
dB(A) limit, stated by the Noise Abatement Act, is shown in the
figure on top of this page.
A remark by the figure is that the geometrical quality of
the data used isn't good enough to include noise from road
traffic in the nationwide overview of disturbance by noise.