PT-5: Quiet Pavement
2-3 points
Goal
Improve human health by reducing tire-pavement noise.
Requirements
Design at least 75% of the total new or reconstructed pavement surface area for
regularly trafficked lanes of pavement where the speed limit meets or exceeds 30 miles
per hour (mph) with a surface course that produces tire-pavement noise levels at or
below those listed in Table PT-5.1, which describes test vehicle speed parameters and
the points corrsponding to the level of noise reduction achieved. Test the pavements
according to the on board sound intensity (OBSI) method desribed by the current
version of AASHTO TP 76. Compute the total surface area of all trafficked lanes that
meets or exceed speed limits of 30 mph and show that a minimum of 75% of this area
meets the tabulated criteria for tire-pavement noise. Do not include shoulders,
medians, sidewalks and other paved areas outside of the travelled way in the
computation.
Documentation
- A list of pavement sections to be built (or reconstructed) and their associated surface material type, AASHTO TP
76 test results, and surface areas, and if design was intended to be quiet or not in accordance with the
requirements of this criterion. This may be included as part of the standard project documentation or as a
separate document.
- A calculation to indicate the total percentage of trafficked lane pavement surface areas surfaced with quiet
pavement.
- A drawing or project map showing locations of quiet pavements. These pavements should be highlighted on
the plan, a scale should be on the plan, and the total surface area of each pavement section should be called
out as a note on the plan.
Resources
PT-5 Noise Wall
Public commentary on credit PT-5
Hi TarekE- As with all of the credits in Greenroads, there are often tradeoffs to consider for sustainability. There are open graded mixes that last a long time in certain environments, and less in others, and it is a designer's responsibility to make the decision if it fits the project context or not. We have tried to be explicit about the potential issues in this credit, so let us know if we need to provide more detail.
Srevice life is a major trade-off for using open graded pavement surface, 8-10 years which is very low. For long life pavements we are looking for pavements that can live 40 years. Additionally noise reduction is not even maintained for the entire service life. I suggest limiting this credit to 1 point untill alternative more effective options are investigated to achieve quiet pavement.
Your comment regarding page 456 is correct. A difference in about 20" of macrotexture would probably not be smooth at all! Thanks! We'll make the other changes too.
In the glossary: please add the word "Studded tire" (in hot countries like Brazil we dont use it).
On page 459, 2nd paragraph: Please check the text "... In these two manners In the U.S. but the on-board sound intensity ..." I mean "In", tue I is in capital.
On page 456, item Smooth surfaces: Please check the text "macrotexture refers to pavement surface elevation changes on the order of 0.2-20 inches,...." Would it be "0.2-2.0 inches"?
On page 455, 5th row of section Credit Requirements: Please check the text "... corrsponding points to the level ..."
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Thanks,
The Greenroads Team
