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Preparatory Studies

Noise protection

The noise pollution from the A 661 interstate is one of the reasons for the plans being drawn up.

To reduce these noise levels the potential impact of a 10-meter-high noise protection wall was also evaluated. This solution was, however, rejected, as a noise protection wall would additionally increase the district’s isolation by the interstate and be detrimental to the parklands. Moreover in certain weather conditions, for example in the event of atmospheric inversion, the noise protection would be considerably reduced.

By covering the A 661 interstate, on the other hand, the disadvantages of a noise protection wall in terms of urban and open space planning, as well as the disadvantages this protection entails can be avoided.

On the basis of the volume of traffic predicted in 2025, the noise in the area in question that is produced by traffic on the A 661 interstate is as follows:

Without noise protection

Kartenausschnitt: Verkehrsuntersuchung Autobahn 661 ohne weitergehende Schallschutzmaßnahme, © Stadtplanungsamt Stadt Frankfurt am Main, TÜV Hessen,  Kartengrundlage: Stadtvermessungsamt Stadt Frankfurt am Main

Illustration 1 shows noise conditions in the case of undisturbed sound propagation at a height of two meters for the nighttime period (10.00 p.m. to 06.00 a.m.).

In Germany there is a norm, the DIN 18005 – Noise Protection in Urban Planning standard, which stipulates how to assess the impact of traffic noise. The non-mandatory figures listed in Supplement 1 to this norm provide information about the appropriate consideration of noise protection in urban planning. The figures are specifications devised by experts to reflect the noise protection objectives that need to be considered in the planning; for this reason they are not statutory limits. To meet expectations with regard to noise pollution protection appropriate to the character of the development zone affected it is, however, desirable that noise levels at least fall within the bounds of these figures.

A comparison with the figures stated in DIN 18005 – Noise Protection in Urban Planning – illustrates how the eastern perimeter of the New Atterberry residential area is considerably affected by noise from the interstate. The figures are exceeded here by up to 10 dB(A), which is perceived as a doubling of the loudness.
On account of the greater distance from the interstate, the noise levels on the southern perimeter of this residential area deviate to a far lesser extent from the DIN figures. They are up to 5 dB(A) above the levels, whereas in the residential area itself noise readings comply with the figures or are lower than the upper thresholds.

Traffic study with development in line with the legal zoning plan and enclosing of the A 661 interstate [7860 KB]

With noise protection

Kartenausschnitt: Verkehrsuntersuchung BAB 661 mit Riegelbebauung und Einhausung, © Stadtplanungsamt Stadt Frankfurt am Main, TÜV Hessen,  Kartengrundlage: Stadtvermessungsamt Stadt Frankfurt am Main

Illustration 2 shows the nighttime noise situation that can be achieved with a 400-meter-long cover structure and an additional block of buildings along the interstate on the eastern perimeter of New Atterberry.

While, as can be expected, the eastern facades of the block would be exposed to considerable noise levels, those facing southwest will be protected so well from the noise levels by the screen the building itself constitutes that the levels will fall within the bounds of the guideline figure of 45 dB. These contrasts must be taken into account in the design of the apartments’ footprints. Exposed to low noise levels, the southwest facades would be better suited to feature balconies and patios.

The pronounced noise protection function of a block of this nature can also be discerned from the fact that in addition the building would considerably lower noise pollution in the New Atterberry residential area. The noise pollution on the eastern perimeter of the quarter would be reduced by up to 10 dB(A), in some cases even by more than 10 dB(A), such that almost the entire quarter would comply with the guideline figures for nighttime noise levels.
The 400-meter-long cover structure would also result in a reduction in the noise level along the entire southern perimeter area of New Atterberry, which would also extend into the residential quarter.
For this reason covering the A 661 interstate for the entire section between Seckbach and Friedberger Landstrasse and for noise protection reasons is not necessary in order to effectively protect the New Atterberry residential quarter from the noise of traffic on the A 661 interstate.

The fact that the impact of the noise protection achieved by extending the cover structure as far as Friedberger Landstrasse would in some cases be ruined by the noise still coming from the latter and the non-enclosed section of the interstate north of the bridge, also speaks against it. The planned block proves to be the more effective solution to this noise.