Italian road noise limits

Note for non-Italian readers. DPR 142/04 is the Italian implementing regulation for road-traffic noise. It defines noise-pertinence bands — strips of land along a road within which road-specific limits apply instead of the general municipal zoning limits (DPCM 14/11/97). It has no direct equivalent in most other European frameworks.

How do you use the tool?

The tool checks whether sound levels at the receiver comply with the Italian DPR 142/04 limits for road-traffic noise. It applies to receivers within the pertinence bands of A, B, C, D roads and to sensitive receivers (schools, hospitals, care homes). Outside the band, or for E and F roads, the municipal DPCM 14/11/97 limits apply.

The tool checks whether sound levels at the receiver comply with the DPR 142/04 limits for road-traffic noise. It applies to:

• receivers within the noise-pertinence bands of A, B, C, D roads;
• sensitive receivers (schools, hospitals, care and rest homes) with a privileged regime.

For receivers outside the band, or for E and F roads, the DPCM 14/11/97 immission limits apply according to the municipal acoustic-zoning class.

How do you read the result?

The result comes in three blocks. The Framing summarises the applied regime — road type, state, band. The daytime and night-time checks compare the L_Aeq with the limit and compute the margin: positive if below the limit, negative if exceeded, zero if at the limit. The Regulatory reference gives the exact table and row of the decree the limit derives from.

The result is organised in three blocks. The Framing summarises the applied regime: road type, state, the band the receiver falls in — or the deferral to DPCM 14/11/97 when the receiver is outside the band or the road is type E/F.

The Daytime check and Night-time check compare the supplied L_Aeq with the applicable limit and compute the margin: positive if below the limit, negative if exceeded, zero if exactly at the limit. The Regulatory reference gives the exact table and row of the decree the limit derives from — useful for traceability in a technical report.

Exceeding a limit does not automatically entail a sanction: for existing roads, returning within the limits is managed through the multi-year remediation plans (DM 29/11/2000). The tool provides the point check, not the regime of derogations.

How does the check work?

The decree defines no formulas: it sets limits to be checked against levels measured or predicted with other methods (NMPB-Routes 2008, CNOSSOS-EU, ISO 1996-2 measurements). The check is L_Aeq,TR ≤ L_lim,TR over the two reference times (daytime 06–22, night-time 22–06). The limit depends on the road class (A–F), its state, the pertinence band and the receiver type.

The decree defines no calculation formulas: it sets limits to be checked against levels measured or predicted with other tools (NMPB-Routes 2008, CNOSSOS-EU methods, ISO 1996-2 measurements). The check is:

$$L_{Aeq,TR}\le L_{\text{lim},TR}TR=\text{daytime }(06\text{–}22)\cdot \text{night-time }(22\text{–}06)$$

The limit L_lim depends on: the road’s administrative class (A…F), its state (new or existing), the pertinence band the receiver falls in, and the receiver type (generic or sensitive).

NEW roads (Table 1)   single band · generic 65/55 · sensitive 50/40
  A 250 m · B 250 m · C1 250 m · C2 150 m · D 100 m

EXISTING roads (Table 2)                generic         sensitive
  A, B   Band A 0-100 m                  70/60           50/40
         Band B 100-250 m                65/55           50/40
  Ca     Band A 0-100 m                  70/60           50/40
         Band B 100-250 m                65/55           50/40
  Cb     Band A 0-100 m                  70/60           50/40
         Band B 100-150 m                65/55           50/40
  Da     0-100 m                         70/60           50/40
  Db     0-100 m                         65/55           50/40

E, F  30 m band · municipal limits (DPCM 14/11/97 Table C)
For schools only the daytime limit applies.

Terms

• Noise-pertinence band — a strip of land along the road where the DPR 142/04 specific limits apply instead of the DPCM 14/11/97 ones. Its width depends on the road class and state.
• Sensitive receiver — schools, hospitals, care and rest homes. They have stricter limits (50/40) given the vulnerability of the activities carried out there.
• L_Aeq,TR — A-weighted equivalent continuous level over the reference time TR (16 daytime hours, 8 night-time).

What are the tool’s limitations?

DPR 142/04 concerns the noise of a specific road infrastructure, not the coexistence of several sources (rail, industry). The limits refer to the most exposed façade and the tool assumes the supplied L_Aeq is already the façade value. The regime of derogations and containment plans (DM 29/11/2000) is outside the tool’s scope.

• DPR 142/04 applies to the noise produced by a specific road infrastructure. It does not consider the coexistence of several sources (rail + road, industry + road): those require a multi-source analysis under other regulations.
• The limits refer to the most exposed façade of the receiver; the tool assumes the supplied L_Aeq is already the façade value.
• For multi-storey receivers the assessment must be done for the most exposed floor.
• The regime of derogations and of noise-containment plans (DM 29/11/2000) in case of exceedance is outside the tool’s scope.

Standards & references

• Italian DPR 30/3/2004 no. 142 — provisions for the containment and prevention of noise pollution from road traffic, under art. 11 of Law 447/95.
• Italian Law 26/10/1995 no. 447 — framework law on noise pollution, art. 11.
• DPCM 14/11/1997 — limit values of noise sources (zoning limits, Table C, applicable outside the band).
• DM 29/11/2000 — criteria for noise-containment and abatement plans.
• Italian Legislative Decree 19/8/2005 no. 194 — implementation of EU Directive 2002/49/EC on environmental noise.