Technical Team Meeting August 12, 2013 CDOT I-70 Mountain Corridor - - PowerPoint PPT Presentation

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Technical Team Meeting August 12, 2013 CDOT I-70 Mountain Corridor - - PowerPoint PPT Presentation

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STATE OF COLORADO DEPARTMENT OF TRANSPORTATION REGION 1 I-70 MTN CORRIDOR PROGRAM 425A CORPORATE CIRLCE - GOLDEN, CO 80401 (720) 497-6900 (OFFICE), (720) 497-6901 (FAX) I-70 EB Peak Period Shoulder Lane Project Project Number: NHPP 0703-401

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Technical Team Meeting

August 12, 2013

CDOT I-70 Mountain Corridor | HDR Engineering, Inc.

STATE OF COLORADO

DEPARTMENT OF TRANSPORTATION REGION 1 I-70 MTN CORRIDOR PROGRAM

425A CORPORATE CIRLCE - GOLDEN, CO 80401 (720) 497-6900 (OFFICE), (720) 497-6901 (FAX)

I-70 EB Peak Period Shoulder Lane Project

Project Number: NHPP 0703-401 Project Code: 19474

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 Introductions  Where we have been  Where we are  Where we are going  Glossary of terms

Meeting Agenda

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 Left versus right  Roadway width  Issue-Specific Criteria

 Widening to the

median versus Clear Creek

 Auxiliary lanes

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Background

Where We’ve Been

  • Finalized Context Statement
  • Finalized Core Values
  • Developed Critical Issues and Project Evaluation Criteria
  • Issues heard from Clear Creek County at July 22 meeting

 Is PPSL compliant with the ROD, especially considering

planned infrastructure improvements such as pullouts, rebuilding acceleration and deceleration lanes and replacing bridges?

 How does CDOT intend to address the safety concerns?

Concerns about access for emergency vehicles; room for broken down vehicles, creating unsafe conditions.

 Is an EA more appropriate than a CatEx? Specific concerns are

related to consideration of alternatives and to enforceable mitigation

 Interim/temporary—Will there be a written commitment to an

end date or triggers for when a more permanent solution will be implemented?

 Not convinced that passive management will keep everyone

safe.

 How can economic viability and livability of CCC communities

be protected/enhanced?

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Background

Where We Are

  • Left versus Right
  • Roadway Width

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Background

Where We Are Going

  • CSS issues tracking schedule
  • CSS issues tracking checklist

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CSS Tracking Schedule

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CSS Tracking Checklist

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CSS: Operability Left vs. Right PPSL Feasibility Review CSS: Roadway Definition Median Widening vs. Creek Encroachment Roadway Width Auxiliary Lanes Snow Removal CSS: Structural Components SH 103 Bridge Bridges in General Retaining Walls Noise Abatement (if needed) AGS CSS: Integral Components Emergency Response Location of Pull-Outs Off-Peak Operations Signage Managed Lane Access Aesthetics Water Quality/ Drainage Greenway Noise Initial Environmental Findings Class of Action ROD Compatibility Interim Definition Safety

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SLIDE 8

Glossary of Terms and Acronyms

  • Acceleration Lane—A lane adjacent to the primary travel lane that allows drivers to accelerate

before merging into traffic on the main road.

  • Auxiliary Lane—Along a highway an auxiliary lane connects entrance and exit ramps, with the

entrance ramp or acceleration lane from one interchange leading to the exit ramp or deceleration lane of the next.

  • Deceleration Lane—A lane adjacent to the primary travel lane that allows drivers to pull off the

main road and decelerate safely in order to turn or exit without slowing the traffic behind.

  • EOP—Edge of pavement
  • General Purpose Lane—A traffic lane that does not have any restrictions, such as time of

day or type of vehicle that may use the lane.

  • Managed Lane—In this case, the managed lane operates during a peak period and traffic

utilizing that lane will be required to pay a toll.

  • Peak Period Shoulder Lane—This is a lane of traffic that may function either as a shoulder

and a managed lane or a shoulder and a general purpose lane, depending on left versus right .

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Left Versus Right

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Best Practices

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  • Priced Dynamic Shoulder

Lane (PDSL)

  • Retrofit that converted right

side bus-only shoulder lane to left side PDSL to avoid ramp conflict area

  • MnDOT working to convert

260 miles of bus-only shoulder lane to PDSLs

MnDOT

I-35W

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Best Practices

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  • Right-side only bus lane

 Bus yields to merging

traffic at on- and off-ramps (bus drivers are specially trained)

  • Left side managed lane
  • Managed through active traffic

management

US 36

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Best Practices

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  • Right side priced dynamic

shoulder lane for general purpose traffic

  • Full ramp reconfigurations to

accommodate safe acceleration/ deceleration during peak and

  • ff-peak operation
  • Extensive signs and active traffic

management

MnDOT

I-494 (design phase)

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SLIDE 13

Best Practices

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  • Right side PPSL for general

purpose traffic

  • No special accommodations at

low volume entrance ramps

  • Provides advanced signing on

ramps to warn motorists

  • Provides emergency turnouts

approximately every ½ mile

  • As a result of a fatal accident new

larger warning signs were added

MassDOT

I-93

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Interchange Applications—Existing Condition and Left Side

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Left Side

  • Add acceleration lane
  • Estimated 11 signs
  • Requires 103 bridge replacement

Existing

Approximate Existing Edge

  • f Travel Lane

Approximate Existing Edge

  • f Travel Lane

Off-Peak Shoulder

  • No general purpose lanes shifts

between on-peak and off-peak

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Interchange Applications— Existing Condition and Right Side

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Right Side

  • Possibility to avoid

acceleration lane

  • Estimated 25 signs
  • Increased safety concerns
  • Possibility to modify

Highway 103 bridge

  • General purpose lanes shift

from on-peak to off-peak

Off-Peak General Purpose Lanes Off-Peak Shoulder

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Interchange Options

SH 103: Existing Condition

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Primary Differentiators

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Right Side

  • Possibility to avoid

acceleration lane

  • Estimated 25 signs
  • Increased safety

concerns

  • Possibility to modify 103

bridge

  • General purpose lanes

are shifted between on- peak and off-peak

Left Side

  • Add acceleration

lane

  • Estimated 11 signs
  • Requires 103 bridge

replacement

  • Reduces potential of

head on collisions during off-peak

  • Maintains rumble

strips on right side

  • f shoulder
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Evaluation Matrix

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See Handout

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Segments

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  • Segment 1: Empire Junction
  • Segment 2: Lawson
  • Segment 3: Downieville/Dumont
  • Segment 4: Fall River
  • Segment 5: West Idaho Springs
  • Segment 6: SH 103
  • Segment 7: East Idaho Springs
  • Segment 8: Twin Tunnels
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Roadway Width

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Typical Sections

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Segment 1: Empire Junction Critical Section

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Segment 2: Law son Critical Section

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Segment 3: Dow nieville/Dumont Critical Section

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Segment 4: Fall River Critical Section

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Segment 5: West Idaho Springs Critical Section

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Segment 6: SH 103 Critical Section

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Segment 7: East Idaho Springs Critical Section

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Roadw ay Width and Retaining Walls

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Total Length

2000 4000 6000 8000 10000 12000 14000 ~6,400 ft ~12, 600 ft Feet

Total Length of Walls

40 ft 42 ft

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Roadw ay Width and Retaining Walls

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Maximum Height

0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 ~ 4.0 ~ 8.9 Feet

Maximum Height of Walls

40 ft 42 ft

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Roadw ay Width and Retaining Walls

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Total Area

5000 10000 15000 20000 25000 ~8,000 ft ~25,000 ft Square Feet

Total Area of Walls

40 ft 42 ft

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Safety

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  • Driver comfort
  • Lane width
  • Shoulder width
  • Curves
  • Weather
  • Speeds
  • Driver expectation
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Primary Differentiators

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Pros Cons 40 ft Width

  • Requires 2 feet of widening
  • Maximum wall height of 2.6 4.0

feet

  • Requires 9 less retaining walls (11

total)

  • Requires 50% more feet of walls

(over 6,300 ft)

  • Requires approximately 50% less

total wall length

  • Substandard lane widths
  • Inconsistent with driver expectancy
  • Additional safety concerns

42 ft Width

  • Standard lane widths
  • Consistent with driver expectancy
  • Requires 4 feet of widening
  • Maximum wall height of 8.9 feet
  • Requires 9 more retaining walls (20

total)

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Evaluation Matrix

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See Handout

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Issues Schedule

Schedule will be used to determine when critical issues will be discussed at the Technical Team meetings.

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  • Widening to the median or creek
  • Auxiliary lanes

Technical Team input

  • n Issue-Specific

Criteria

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W eek No. Mon Tues W ed Thurs Fri

1 FHWA Afternoons CCC Commission I-70 Coalition Board 10-12 2

PPSL PLT/ TT - Morning

FHWA Afternoons CCC Commission AGS PLT Incident Mgmt/ I-70 Coalition 3 FHWA Afternoons CCC Commission Commission CDOT Accountability Commission 470 Meeting (Afternoon) 4

PPSL PLT/ TT - Morning

FHWA Afternoons CCC Commission T&R PLT Twin Tunnels TT I-25 Region 4

PLT & TT Recurring Meeting Tim e

Meeting Dates

August 26—Idaho Springs September 9—Golden September 23—Idaho Springs All meetings begin at 9:00 a.m.

Meeting Locations: Split between Golden and Idaho Springs

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Technical Team Meeting

August 12, 2013

CDOT I-70 Mountain Corridor | HDR Engineering, Inc.

STATE OF COLORADO

DEPARTMENT OF TRANSPORTATION REGION 1 I-70 MTN CORRIDOR PROGRAM

425A CORPORATE CIRLCE - GOLDEN, CO 80401 (720) 497-6900 (OFFICE), (720) 497-6901 (FAX)

I-70 EB Peak Period Shoulder Lane Project

Project Number: NHPP 0703-401 Project Code: 19474

THANK YOU!

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Basement

  • Checklist for CSS (White)
  • Breakfast

Pastries, coffee, bottled water, bottled juice

  • Lunch

Taco bar, bottled water, soft drinks, dessert

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