to theto the Lake Champlain Bridge Project Public Advisory ......June 20, 2008 PAC Meeting...

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to theto the

Lake Champlain Bridge ProjectLake Champlain Bridge Project

Public Advisory Committee (PAC)Public Advisory Committee (PAC) Third Organizational MeetingThird Organizational Meeting

1:00 PM to 4:00 PM JUNE 20, 2008

Ticonderoga Middle School

Welcome!Welcome!Welcome!

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June 20, 2008 PAC Meeting presentation on

DESIGN CRITERIA June 20, 2008 PAC Meeting presentation onJune 20, 2008 PAC Meeting presentation on

DESIGN CRITERIADESIGN CRITERIA

Presented by Geoff Wood, NYSDOTPresented by Geoff Wood, NYSDOT22

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June 20, 2008 PAC Meeting presentation on

DESIGN CRITERIA June 20, 2008 PAC Meeting presentation onJune 20, 2008 PAC Meeting presentation on

DESIGN CRITERIADESIGN CRITERIA

Presented by Geoff Wood, NYSDOTPresented by Geoff Wood, NYSDOT

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Questions to be answered: - What criteria will be used to design this project? - How are the numeric values established for each criteria? - What are the specific values for this project? - How do these values compare with existing conditions? - Will proposed alternatives fully attain each of the criteria?

Questions to be answered:Questions to be answered: -- What criteria will be used to design this project?What criteria will be used to design this project? -- How are the numeric values established for each criteria?How are the numeric values established for each criteria? -- What are the specific values for this project?What are the specific values for this project? -- How do these values compare with existing conditions?How do these values compare with existing conditions? -- Will proposed alternatives fully attain each of the criteria?Will proposed alternatives fully attain each of the criteria?

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• For this project to be eligible for federal funding, the Federal Highway Administration (FHWA) requires American Association of State Highway Transportation Official (AASHTO) design standards to be met. Any proposed feature that will not fully meet standards must be justified and approved.

• FHWA requirements and AASHTO standards apply to the entire project, including the portions in New York as well as Vermont.

• As the project sponsor, New York State Department of Transportation (NYSDOT) procedures are being used to progress design of the project.

• NYSDOT's design criteria are based on AASHTO's recommended design standards and are approved by FHWA.

• While this presentation includes design guidance, data, and photos primarily from New York State the concepts and requirements are applicable to the entire project.

•• For this project to be eligible for federal funding, the FederalFor this project to be eligible for federal funding, the Federal Highway Administration (FHWA) requires American Association Highway Administration (FHWA) requires American Association of State Highway Transportation Official (AASHTO) design of State Highway Transportation Official (AASHTO) design standards to be met. Any proposed feature that will not fully standards to be met. Any proposed feature that will not fully meet standards must be justified and approved.meet standards must be justified and approved.

•• FHWA requirements and AASHTO standards apply to the entire FHWA requirements and AASHTO standards apply to the entire project, including the portions in New York as well as Vermont.project, including the portions in New York as well as Vermont.

•• As the project sponsor, New York State Department of As the project sponsor, New York State Department of Transportation (NYSDOT) procedures are being used to progress Transportation (NYSDOT) procedures are being used to progress design of the project.design of the project.

•• NYSDOT's design criteria are based on AASHTO's recommended NYSDOT's design criteria are based on AASHTO's recommended design standards and are approved by FHWA.design standards and are approved by FHWA.

•• While this presentation includes design guidance, data, and While this presentation includes design guidance, data, and photos primarily from New York State the concepts and photos primarily from New York State the concepts and requirements are applicable to the entire project.requirements are applicable to the entire project.

PREFACEPREFACEPREFACE

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NYSDOT Highway Design Manual (HDM)NYSDOT Highway Design Manual (HDM)NYSDOT Highway Design Manual (HDM)

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The 17 critical design elementsThe 17 critical design elementsThe 17 critical design elements

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Factors which influence criteria valuesFactors which influence criteria valuesFactors which influence criteria values

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• Highway functional classification•• Highway functional classificationHighway functional classification

DESIGN CRITERIA ARE A FUNCTION OF:DESIGN CRITERIA ARE A FUNCTION OF:DESIGN CRITERIA ARE A FUNCTION OF:

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Functional Classification Map for Essex County, NY

Functional Classification MapFunctional Classification Map for Essex County, NYfor Essex County, NY

Project LocationProject LocationProject Location

Note: Project limits are not confined to New York State.

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Functional Classification Map for Essex County, NY

Functional Classification MapFunctional Classification Map for Essex County, NYfor Essex County, NY

Project Location Project Project

LocationLocation

NYS Route 185 (formerly 910L) is classified as a Rural Minor Arterial NYS Route 185 (formerly 910L) is NYS Route 185 (formerly 910L) is classified as a Rural Minor Arterialclassified as a Rural Minor Arterial

Note: Project limits are not confined to New York State.

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• Highway functional classification• Traffic volumes (including trucks)•• Highway functional classificationHighway functional classification•• Traffic volumes (including trucks)Traffic volumes (including trucks)


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NYSDOT Highway Sufficiency Data (2005)NYSDOT Highway Sufficiency Data (2005)NYSDOT Highway Sufficiency Data (2005)

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NYSDOT Highway Sufficiency Data (2005)NYSDOT Highway Sufficiency Data (2005)NYSDOT Highway Sufficiency Data (2005)

As of 2005, the Average Annual Daily Traffic (AADT) along NYS Route 185 (formerly 910L) was estimated to be 2,860 vehicles, including 8% trucks. Highway Sufficiency Data is normally used until project specific counts, if warranted, can be taken.

As of 2005, the Average Annual Daily As of 2005, the Average Annual Daily Traffic (AADT) along NYS Route 185 Traffic (AADT) along NYS Route 185 (formerly 910L) was estimated to be (formerly 910L) was estimated to be 2,860 vehicles, including 8% trucks. 2,860 vehicles, including 8% trucks. Highway Sufficiency Data is normally Highway Sufficiency Data is normally used until project specific counts, if used until project specific counts, if warranted, can be taken.warranted, can be taken.

* Route 910L was recently redesignated as State Touring Route NY 185

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• Highway functional classification• Traffic volumes (including trucks)• Operating speed

•• Highway functional classificationHighway functional classification•• Traffic volumes (including trucks)Traffic volumes (including trucks)•• Operating speedOperating speed


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POSTED SPEEDPOSTED SPEEDPOSTED SPEED

Posted speed limit influences operating speeds. Along NYS Route 185 the posted speed limit is 55 mph except for a short distance immediately before the bridge.

Posted speed limit influences Posted speed limit influences operating speeds. Along NYS operating speeds. Along NYS Route 185 the posted speed Route 185 the posted speed limit is 55 mph except for a limit is 55 mph except for a short distance immediately short distance immediately before the bridge. before the bridge.

Note: 55 mph = 89 km/h 30 mph = 48 km/h

Note: Note: 55 mph = 89 km/h 55 mph = 89 km/h 30 mph = 48 km/h30 mph = 48 km/h

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OPERATING SPEEDOPERATING SPEEDOPERATING SPEED

While posted speed limits influence operating speed, it's not uncommon for actual travel speeds in an area to exceed the posted limit. This is why Design Speed is not based on the posted speed limit. Operating speed is determined by taking measurements within the project limits.

While posted speed limits influence While posted speed limits influence operating speed, it's not uncommon for operating speed, it's not uncommon for actual travel speeds in an area to actual travel speeds in an area to exceed the posted limit. This is why exceed the posted limit. This is why Design Speed is Design Speed is notnot based on the based on the posted speed limit. Operating speed is posted speed limit. Operating speed is determined by taking measurements determined by taking measurements within the project limits. within the project limits.

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Selecting Design SpeedSelecting Design SpeedSelecting Design SpeedThe higher of these two values is normally used. Until a speed study is completed the maximum functional class speed is used.

The higher of these two values is normally The higher of these two values is normally used. Until a speed study is completed the used. Until a speed study is completed the maximum functional class speed is used. maximum functional class speed is used.

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• Highway functional classification• Traffic volumes (including trucks)• Operating speed• Terrain (level, rolling, mountainous)

•• Highway functional classificationHighway functional classification•• Traffic volumes (including trucks)Traffic volumes (including trucks)•• Operating speedOperating speed•• Terrain (level, rolling, mountainous)Terrain (level, rolling, mountainous)


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How Terrain Influences Design CriteriaHow Terrain Influences Design CriteriaHow Terrain Influences Design Criteria

Project LocationProject LocationProject Location

2020


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• Highway functional classification• Traffic volumes (including trucks)• Operating speed• Terrain (level, rolling, mountainous)• Development density and land use

•• Highway functional classificationHighway functional classification•• Traffic volumes (including trucks)Traffic volumes (including trucks)•• Operating speedOperating speed•• Terrain (level, rolling, mountainous)Terrain (level, rolling, mountainous)•• Development density and land useDevelopment density and land use


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How Land Use Influences Design CriteriaHow Land Use Influences Design CriteriaHow Land Use Influences Design Criteria

Less development means fewer points of conflict and leads to higher travel speeds.

Less development Less development means fewer points of means fewer points of conflict and leads to conflict and leads to higher travel speeds. higher travel speeds.

More development leads to more points of conflict and slower speeds.

More development leads More development leads to more points of conflict to more points of conflict and slower speeds.and slower speeds.

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• Highway functional classification• Traffic volumes (including trucks)• Operating speed• Terrain (level, rolling, mountainous)• Development density and land use• Project type

•• Highway functional classificationHighway functional classification•• Traffic volumes (including trucks)Traffic volumes (including trucks)•• Operating speedOperating speed•• Terrain (level, rolling, mountainous)Terrain (level, rolling, mountainous)•• Development density and land useDevelopment density and land use•• Project typeProject type


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Project TypeProject TypeProject Type

Project type dictates how far into the future needs should be considered in order to ensure short term investments have lasting value. The future date is known as the 'Design Year'. ETC stands for Estimated Time of Completion of the project.

Project type dictates how far into the future needs should be Project type dictates how far into the future needs should be considered in order to ensure short term investments have considered in order to ensure short term investments have lasting value. The future date is known as the 'Design Year'. lasting value. The future date is known as the 'Design Year'. ETC stands for Estimated Time of Completion of the project. ETC stands for Estimated Time of Completion of the project.

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• Highway functional classification• Traffic volumes (including trucks)• Operating speed• Terrain (level, rolling, mountainous)• Development density and land use• Project type• Other factors including accident history

and special truck routes

•• Highway functional classificationHighway functional classification•• Traffic volumes (including trucks)Traffic volumes (including trucks)•• Operating speedOperating speed•• Terrain (level, rolling, mountainous)Terrain (level, rolling, mountainous)•• Development density and land useDevelopment density and land use•• Project typeProject type•• Other factors including accident history Other factors including accident history

and special truck routesand special truck routes


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Designated Routes for Oversized TrucksDesignated Routes for Oversized TrucksDesignated Routes for Oversized Trucks

NYS Route 185 (formerly 910L) is listed as a Qualifying Highway.

NYS Route 185 (formerly 910L) is NYS Route 185 (formerly 910L) is listed as a Qualifying Highway.listed as a Qualifying Highway.

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Allowable Truck Widths and Lengths for Qualifying Highways

Allowable Truck Widths and Lengths for Allowable Truck Widths and Lengths for Qualifying HighwaysQualifying Highways

Allowable truck width = 110", or 9'-2" Allowable truck width Allowable truck width = 110", or 9'= 110", or 9'--2"2"

Allowable truck length varies by tractor/trailer combo type as shown

Allowable truck length Allowable truck length varies by tractor/trailer varies by tractor/trailer combo type as showncombo type as shown

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Design Criteria Program InputDesign Criteria Program InputDesign Criteria Program Input

Project type is based on pavement work. Choices are: reconstruction, major rehab, minor rehab, or new

Project type is Project type is based on based on pavement work. pavement work. Choices are: Choices are: reconstruction, reconstruction, major rehab, major rehab, minor rehab, or minor rehab, or newnew

Accident history will be reviewed during project scoping

Accident Accident history will history will be reviewed be reviewed during during project project scopingscoping

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Design Criteria Program OutputDesign Criteria Program OutputDesign Criteria Program Output

The 17 critical design

elements

The 17 The 17 critical critical design design

elementselements

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Design Criteria Program OutputDesign Criteria Program OutputDesign Criteria Program Output

Program provides values

for these 10

elements

Program Program provides provides values values

for these for these 10 10

elementselements

Other sources must be used for these 4

elements

Other Other sources sources must be must be used for used for these 4 these 4

elementselements

The remaining 3 elements are not applicable in this case.

The remaining The remaining 3 elements are 3 elements are not applicable not applicable in this case.in this case.

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Other Sources: NYSDOT Bridge ManualOther Sources: NYSDOT Bridge ManualOther Sources: NYSDOT Bridge Manual

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Bridge Roadway WidthBridge Roadway WidthBridge Roadway Width

Regardless of the type of bridge work, the minimum required bridge roadway width is the full approach width

Regardless of the type of bridge Regardless of the type of bridge work, the work, the minimumminimum required required bridge roadway width is the full bridge roadway width is the full approach widthapproach width

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Vertical ClearanceVertical ClearanceVertical Clearance

(14 ft)(14 ft) (14'(14'--6")6")

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Structural CapacityStructural CapacityStructural Capacity

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Structural Capacity: New or Replacement BridgesStructural Capacity: New or Replacement BridgesStructural Capacity: New or Replacement Bridges

Large tractor-trailersLarge tractorLarge tractor--trailerstrailers

Special permit vehiclesSpecial permit vehiclesSpecial permit vehicles

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Structural Capacity: Rehabilitated BridgesStructural Capacity: Rehabilitated BridgesStructural Capacity: Rehabilitated Bridges

Large box trucksLarge box trucksLarge box trucks

Average tractor-trailersAverage tractorAverage tractor--trailerstrailers

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Other Sources: HDM Chapter 18Other Sources: HDM Chapter 18Other Sources: HDM Chapter 18

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Pedestrian Accommodation PolicyPedestrian Accommodation PolicyPedestrian Accommodation Policy

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Resulting Design Criteria Table:Resulting Design Criteria Table:Resulting Design Criteria Table:

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Existing Conditions: Lane and Shoulder Widths:Existing Conditions: Lane and Shoulder Widths:Existing Conditions: Lane and Shoulder Widths:

Pavement widening on NY side within the 30 mph zone

likely a carry-over from toll bridge era.

Pavement widening Pavement widening on NY side within on NY side within the 30 mph zone the 30 mph zone

likely a carrylikely a carry--over over from toll bridge era.from toll bridge era.

Lane & shoulder widths appear narrower on

VT side

Lane & shoulder Lane & shoulder widths appear widths appear narrower on narrower on

VT sideVT side

Lane & shoulder widths within 55 mph zone more representative.

Lane & shoulder Lane & shoulder widths within 55 widths within 55 mph zone more mph zone more representative.representative.

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Design Criteria vs. Existing Conditions:Design Criteria vs. Existing Conditions:Design Criteria vs. Existing Conditions:

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Design Criteria vs. Proposed Conditions:Design Criteria vs. Proposed Conditions:Design Criteria vs. Proposed Conditions:

Proposed conditions will be determined for each design alternative as those alternatives are developed. The retention, or creation of conditions which do not meet the minimum required design criteria would have to be justified and approved as non-standard features.

Proposed conditions will be Proposed conditions will be determined for each design determined for each design alternative as those alternatives are alternative as those alternatives are developed. The retention, or creation developed. The retention, or creation of conditions which do not meet the of conditions which do not meet the minimum required design criteria minimum required design criteria would have to be justified and would have to be justified and approved as nonapproved as non--standard features.standard features.

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Questions / AnswersQuestions / AnswersQuestions / Answers

to theto the Lake Champlain Bridge Project Public Advisory ......June 20, 2008 PAC Meeting...

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