PowerPoint Presentation · 2018-10-29 · The addition or relocation of interchange lanes or ramps...

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ENV125 Basics of Traffic Noise and TxDOT’s

Policy

9/12/18

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Agenda

Introduction and Overview

– Traffic Noise Toolkit

Fundamentals of Noise

Traffic Noise Analysis Process

– Regulations and Guidance

• The major objectives of a traffic noise analysis

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Traffic Noise Toolkit

All current noise guidance and information in one place!

http://www.txdot.gov/inside-txdot/division/environmental/compliance-toolkits/traffic-noise.html

2011 Guidelines for the Analysis and Abatement of Roadway Traffic Noise (Proposed 2018 TxDOT Noise Policy)

Federal Rule: 23 CFR 772

Traffic Noise Handbook (to be replaced by Implementation Guidance)

Document Template Text

Letters to Local Officials Template

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Traffic Noise Guidance and Policy

TxDOT’s Traffic Noise

Policy (2018)

PROPOSED

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Sound/Noise

Noise Analyses

Sound/Noise

O

V

E

R

V

I

E

W

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Highway Traffic Sound

Source Receiver < Propagation Medium >

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Decibel

A-weighting

Equivalent Level

Decibel

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Rock Band

Pneumatic Hammer

Food Blender

Downtown

Vacuum Cleaner

Air Conditioning Unit

Dishwasher

Library

6,324,555

2,000,000

632,456

200,000

63,246

20,000

6,325

2,000

110

100

90

80

70

60

50

40

PRESSURE micro Pascals

SOURCES

LEVEL decibels

L 10log (P )

(P ) 10log

(P )

(P )

D

D (St)

2

ref

2

o

2

ref

2

o

2

2 2

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SOURCES

Rock Band

Pneumatic Hammer

Food Blender

Downtown

Vacuum Cleaner

Air Conditioning Unit

Dishwasher

Library

LEVEL decibels

110

100

90

80

70

60

50

40

x2

120

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A-weighting

Decibel

A-weighting

Equivalent Level

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6,300 1,000 7 8 9 >

4 5 6 <

1 2 3 /

DIS PRO OUT SEC

ENT NEX CLR SFT

0 + - %

SOUND ANALYZER

MIKEE-LECTRONICS

65 70 75 85 75 70 65

-weighting

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Decibel

Equivalent Level

A-weighting

Equivalent Level

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L = 10log 1T

10 L10

eq 10t

t=1

N

time

sound level

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SOUND LEVEL

-1 dBA Not perceptible

-3 dBA Barely perceptible

-5 dBA Readily perceptible

Change Loudness Subjective

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O

V

E

R

V

I

E

W

Sound/Noise

Noise Analyses Noise Analyses

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Traffic Noise Guidance and Policy

TxDOT guidelines

conform to federal rule

(regardless of funding)

–23 CFR 772

TxDOT’s Guidelines for

the Analysis and

Abatement of Roadway

Traffic Noise (2011)

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Determine if a Type I project

The construction of a highway on new location; or,

The physical alteration of an existing highway where there is either:

– Substantial Horizontal Alteration

– Substantial Vertical Alteration

The addition of a through-traffic lane(s)

The addition of an auxiliary lane, except for when the auxiliary lane is a turn lane; or,

The addition or relocation of interchange lanes or ramps added to a quadrant to complete an existing partial interchange; or,

Restriping existing pavement for the purpose of adding a through-traffic lane or an auxiliary lane; or,

The addition of a new or substantial alteration of a weigh station, rest stop, ride-share facility, or toll plaza.

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TRAFFIC DATA!!!!

First thing to do when you know you have a Type I analysis

GET TRAFFIC DATA!!!!

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Traffic Information

Existing

Predicted

Speed Limits

Collect Data

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TRAFFIC DATA!!!!

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Receiver < Propagation Medium > Source

- Future -- 20 years

- Existing Traffic

Traffic Data

- Future Traffic

- Worse-Case

- Full Speed

- Predicted dBA

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Traffic Data Request

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When requesting Traffic Data use

TPP Form 2124

Make sure to check Box 1 (Basic

Highway Traffic Data), 2 (Vehicle

Classification for Environmental

Studies), 3 (Line Diagram Analysis)

ALL TRAFFIC MUST BE FROM TPP

OR APPROVED BY TPP

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Traffic Data

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Traffic Data: Line Diagram with Turning Movements

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Light Duty Vehicles

Medium Duty Vehicles

Heavy Duty Vehicles

% of ADT % of DHV

91.0 92.8

6.0 4.2

3.0 3.0

% of ADT % of DHV

97.0 98.3

2.0 1.7

1.0 0.0

Frontage Roads

and

Streets

Mainlanes

K-factor: 10.5%

31800

21700

3600

1600

4700

3000

33900

22600 31800

21700

35200

23500

6200

4100

1300

900

1000

500

1000

500

3400

1500 800

400

800

400 4900

3200

AVERAGE DAILY TRAFFIC (ADT) VOLUMES

SH 123

DHV = ADT (x) K-factor

65 SPEED

LIMIT

40 SPEED

LIMIT

LEGEND

1000 - 2015 ADT

1000 - 2035 ADT

Projects that involve more than

mainlanes and frontage roads typically

with require a depiction of turning

movements - - from TPP.

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Determine Need for Traffic Noise

Analysis of a Highway Project

- New Location, or

- Substantial Realignment, or

- Addition of Through-Traffic Lane

Analysis not

required

Traffic

Information

Design

Information

Measure/Model

Noise Levels

Existing Levels Predicted Levels

Predicted levels exceed

existing by more than 10 dBA

Predicted levels approach,

equal, or exceed the NACOR

Consider/Evaluate

Abatement Measures

Traffic

Management

Alteration of

Alignment

Acquisition of

Buffer Zone

Construction of

Noise Barriers

Insulation of

Public Buildings

Construction

Noise

Information for

Local Officials

NOYES

IF

IF

NO

YES

Determine Impact

Additional

Topics

Collect Data

Abatement not

required

Project

Reevaluation

Collect Data Design

Information

Roadways

Receivers

Site Characteristics

Source of Sound

Receiver of Sound

Propagation Path

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Roadway Design and Site Characteristics

Electronic CAD files with Roadway Design

– Striping

– Edge of Pavement

– Any other relevant design information

Adjacent Topography if available

– Other sources would be GIS, Google Earth, Surveys

ELEVATIONS ARE CRITICAL TO BARRIER DESIGN

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A Brief Overview of the Traffic Noise Process

The major objectives of a traffic noise analysis are to:

– Identify areas where possible noise impacts may occur for each project

alternative.

– Consider and evaluate abatement measures to mitigate these impacts.

– Propose implementation of feasible and reasonable abatement measures.

– Communicate the results to the public and local officials.

Important: it is never too early to discuss possible noise abatement

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Identify adjacent land uses

for noise sensitive areas

(residences, schools,

churches, parks, etc)

INCLUDES PERMITTED

DEVELOPMENT

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Noise Receiver Selection Criteria

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FHWA’s Traffic Noise Model

(TNM) is used to model all

impacts

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Table 6: NOISE ABATEMENT CRITERIA

Activity

Category

FHWA

(dB(A)

Leq)

TxDOT

(dB(A)

Leq)

Description of Land Use Activity Areas

A 57

(exterior)

56

(exterior)

Lands on which serenity and quiet are of extra-

ordinary significance and serve an important public

need and where the preservation of those qualities is

essential if the area is to continue to serve its

intended purpose.

B 67

(exterior)

66

(exterior)

Residential

C 67

(exterior)

66

(exterior)

Active sport areas, amphitheaters, auditoriums,

campgrounds, cemeteries, day care centers,

hospitals, libraries, medical facilities, parks, picnic

areas, places of worship, playgrounds, public

meeting rooms, public or nonprofit institutional

structures, radio studios, recording studios,

recreation areas, Section 4(f) sites, schools ,

television studios, trails, and trail crossings

D 52

(interior)

51

(interior)

Auditoriums, day care centers, hospitals, libraries,

medical facilities, places of worship, public



schools, and television studios

E 72

(exterior)

71

(exterior)

Hotels, motels, offices, restaurants/bars, and other

developed lands, properties, or activities not included

in A-D or F.

F -- -- Agricultural, airports, bus yards, emergency services,

industrial, logging, maintenance facilities,

manufacturing, mining, rail yards, retail facilities,

shipyards, utilities (water resources, water treatment,

electrical), and warehousing.

G -- -- Undeveloped lands that are not permitted.

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- New Location, or



Analysis not

required

Traffic

Information

Design

Information

Measure/Model

Noise Levels






Consider/Evaluate

Abatement Measures

Traffic

Management

Alteration of

Alignment

Acquisition of

Buffer Zone

Construction of

Noise Barriers

Insulation of

Public Buildings

Construction

Noise

Information for

Local Officials

NOYES

IF

IF

NO

YES

Determine Impact

Additional

Topics

Collect Data

Abatement not

required

Project

Reevaluation

Determine Impact


equal, or exceed the NAC

ABSOLUTE CRITERION



RELATIVE CRITERION

OR

IF

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Table 6: NOISE ABATEMENT CRITERIA

Activity

Category

FHWA

(dB(A)

Leq)

TxDOT

(dB(A)

Leq)

Description of Land Use Activity Areas

A 57

(exterior)

56

(exterior)

Lands on which serenity and quiet are of extra-

ordinary significance and serve an important public

need and where the preservation of those qualities is

essential if the area is to continue to serve its

intended purpose.

B 67

(exterior)

66

(exterior)

Residential

C 67

(exterior)

66

(exterior)

Active sport areas, amphitheaters, auditoriums,

campgrounds, cemeteries, day care centers,

hospitals, libraries, medical facilities, parks, picnic

areas, places of worship, playgrounds, public



recreation areas, Section 4(f) sites, schools ,

television studios, trails, and trail crossings

D 52

(interior)

51

(interior)

Auditoriums, day care centers, hospitals, libraries,

medical facilities, places of worship, public



schools, and television studios

E 72

(exterior)

71

(exterior)

Hotels, motels, offices, restaurants/bars, and other

developed lands, properties, or activities not included

in A-D or F.

F -- -- Agricultural, airports, bus yards, emergency services,

industrial, logging, maintenance facilities,

manufacturing, mining, rail yards, retail facilities,

shipyards, utilities (water resources, water treatment,

electrical), and warehousing.

G -- -- Undeveloped lands that are not permitted.

I M P A C T ? ABSOLUTE CRITERION RELATIVE

OR, if predicted levels exceed


“approach, equal or exceed”

FHWA Noise Abatement Criteria

” ……1 dBA below

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- New Location, or



Analysis not

required

Traffic

Information

Design

Information

Measure/Model

Noise Levels






Consider/Evaluate

Abatement Measures

Traffic

Management

Alteration of

Alignment

Acquisition of

Buffer Zone

Construction of

Noise Barriers

Insulation of

Public Buildings

Construction

Noise

Information for

Local Officials

NOYES

IF

IF

NO

YES

Determine Impact

Additional

Topics

Collect Data

Abatement not

required

Project

Reevaluation

Determine

Noise Levels


Measured by

Sound Meter

Modeled by

Computer

OR Modeled

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alternative.





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Noise Barrier

Source Receiver - Propagation Path -

Noise Abatement

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- New Location, or



Analysis not

required

Traffic

Information

Design

Information

Measure/Model

Noise Levels






Consider/Evaluate

Abatement Measures

Traffic

Management

Alteration of

Alignment

Acquisition of

Buffer Zone

Construction of

Noise Barriers

Insulation of

Public Buildings

Construction

Noise

Information for

Local Officials

NOYES

IF

IF

NO

YES

Determine Impact

Additional

Topics

Collect Data

Abatement not

required

Project

Reevaluation

Reasonable AND

Propose

Abatement

Evaluate

Abatement Measures

Feasible

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Cost Reasonableness

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2018

2011 • Less than 1388 square feet per

benefiting receiver

• ($18 square foot/$25k per benefiter)

• Less than 1500 square feet

per benefiting receiver

• $35 square foot

• $52.5k per benefiter

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Cost Reasonableness

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• Less than 1500 square feet per

benefiting receiver

• ($35 square foot/$52.5k per

benefiter)

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Cost Reasonableness

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• Less than 1500 square feet per

benefiting receiver

• ($35 square foot/$52.5k per

benefiter)

12’

375’

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Feasible

effective reduction in noise -?

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Feasible

-? -5 (or more)

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Feasible

-? -5 (or more)

Reasonable

Cost-reasonableness

Criterion

Size for each

Benefited Receiver

1500 square feet (or less)

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Reasonable

1500 sq ft (or less)

-? (or more)

AND

Feasible

-5

-4 -4 -5 -5 -5 -7 -5 -5

? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? NOISE BARRIER ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?

For Example

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-? -5 (or more)

Feasible

(or less)

Reasonable

AND

Total Cost 6,000 total sq ft

-4 -4 -5 -5 -5 -7 -5 -5 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? NOISE BARRIER ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?

6 benefiters

= 1,000 sq ft

Sq Ft for each

Benefited Receiver

Total Sq Ft

#Benefited =

1,500 sq ft

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alternative.





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Noise Barrier

AKA Sound Walls

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Why not pavement or vegetation?

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15 feet

Vegetation

100 feet = perceptible

reduction

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Vegetation

- dense enough that it cannot be seen through

- coverage: floor to canopy

- evergreen

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- dense enough that it cannot be seen through

- coverage: floor to canopy

- evergreen

Vegetation

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Vegetation

“... provides only psychological benefits”

“... may be provided for visual, privacy or

aesthetic treatment”

“... not a noise abatement measure”

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Pavement

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PRIORITIES NOISE SAFETY DURABILITY

*FHWA: “should never be jeopardized”

* *

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FHWA Concern ….. can “quiet”

pavement continue to effectively

reduce noise levels over the life

of the pavement?

FHWA

Traffic Noise

Policy

“The use of specific pavement

types or surface textures must

not be considered as a noise

abatement measure.”

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FHWA Concern ….. can “quiet”

pavement continue to effectively

reduce noise levels over the life

of the pavement?

FHWA

Traffic Noise

Policy

“The use of specific pavement

types or surface textures must

not be considered as a noise

abatement measure.”

“Additional research is needed to

determine to what extent different

types of pavements contribute to

traffic noise.”

research

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alternative.




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Documentation Templates

http://ftp.dot.state.tx.us/pu

b/txdot-

info/env/toolkit/730-01-

ds.pdf

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http://ftp.dot.state.tx.us/pub/txdot-info/env/toolkit/730-01-ds.pdf








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Noise Workshop

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??????????????????????? SOUND WALL ??????????????????????

Consent of a Majority of BENEFITING AND ABUTTING Property Owners

Benefiting receivers can be on the second (or any row)!!!

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Noise Workshop

Purpose: to provide sufficient information to owners of property benefiting

and abutting a proposed noise barrier(s) that will allow these owners to make

an informed vote for or against the proposed noise barrier(s).

Timing: after the public hearing has occurred

INFORMAL PUBLIC INVOLVEMENT CAN HAPPEN AT ANY TIME IN THE

PROJECT’S DEVELOPMENT.

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Noise Workshop: Sample Ballot

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NOISE BARRIER BALLOT SH 286 EXPANSION and SH 358 INTERCHANGE PROJECT

NOISE WORKSHOP, May 23, 2000

In conjunction with the SH 286 expansion and SH 358 interchange project, the Texas Department of Transportation proposes to construct a noise barrier within the right-of-way west of SH 286 between Gollihar Road and Mansheim Drive. However, the proposed noise barrier cannot be constructed without the approval, by majority vote, of adjacent property owners. 1. Do you own property adjacent to the right-of-way west of SH 286 between Gollihar

Road and Mansheim Drive? YES ______ NO ______

2. FULL NAME (please print)

ADDRESS TELEPHONE NO. _____________________________

3. Are you for or against the construction of the proposed noise barrier within the right-of-way west of SH 286 between Gollihar Road and Mansheim Drive? Only one vote is allowed for each property.

FOR _____ AGAINST _____ This vote is final.

4. Comments (use reverse if necessary):

SIGNATURE (required) __________________________________ DATE

The ballot must be completed and signed by the property owner of record.

If possible, please bring your completed and signed ballot to the Noise Workshop.

If you are not able to attend the Noise Workshop, please send your completed and signed ballot (must be postmarked no later than ……………) to: Texas Department of Transportation, Attention: …………..P.O. Box 9907, Corpus Christi, TX, 78469-9907.

1) Adjacent property owners will be notified of the results of the vote for or against the proposed noise barrier after all ballots have been received and counted.

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Noise Workshop: Mailing

Mailing preferably by prestamped/preaddressed return envelope

include a description of the noise barrier and the noise effects with and

without the barrier.

Include a description of the decision making process that TxDOT will follow to

assess the survey/ballot results and make a decision on whether to build the

barrier.

Include an invitation to the meeting with the location and time

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Letters to Local Officials

Used to inform local officials regarding the department’s responsibilities

regarding noise abatement for new development once an environmental

decision has been made.

Required for all projects adjacent to undeveloped lands

Cannot occur before document has been signed

Minimal notification:

– Urban area is the Mayor’s Office

– Rural or suburban area, the County Judge’s Office.

Template letter found in Traffic Noise Toolkit

Notice of Availability Template found in Public Involvement Toolkit

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http://www.txdot.gov/inside-txdot/division/environmental/compliance-toolkits/public-involvement.html

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ECOS Documentation

Noise Workshop Summary

– Documentation of the completed traffic noise workshops shall include:

• a summary of the materials presented

• comments from the public and associated responses, and

• the results of the ballots for each proposed barrier.

Noise Analysis Technical Reports

Super 2 correspondence

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ECOS Documentation – TNM model

TNM model

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Noise Workshop

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PowerPoint Presentation · 2018-10-29 · The addition or relocation of interchange lanes or ramps...

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