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Concepts

Welcome to the concepts page for the I-84 Danbury Project. This page includes concepts that are being developed for the I-84 corridor between Interchanges 1 and 8. As concepts are developed, they will be added to this page. There may be up to 20+ concepts that can be mixed and matched together to create an overall series of recommendations that can improve the mobility on and around I-84 in Danbury. Each concept number is an identifier to reference the concept and does not imply prioritization. The concepts will be added as they are completed and not necessarily in sequential order.

Please review a concept by clicking the Learn More button. Concepts can also be filtered by clicking the green mainline button, blue interchange button, or gray non-highway button below. In addition, clicking Advancing Concepts or Not Advancing Concepts will allow you to filter concepts based on whether or not they are recommended for further evaluation.

Concept 1

Graphical drawing on Concept 1

Concept 1 seeks to create lane continuity, eliminate left-hand exit ramps, and, where possible, improve horizontal curvature and vertical geometry. This concept endeavors to maintain the current alignment of I-84 and stay within the existing right-of-way to the greatest extent possible.

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Concept 1: Lane Add – Mainline

Graphical drawing on Concept 1

Concept 1 seeks to create lane continuity, eliminate left-hand exit ramps, and, where possible, improve horizontal curvature and vertical geometry. This concept endeavors to maintain the current alignment of I-84 and stay within the existing right-of-way to the greatest extent possible. The primary component of this concept is the addition of travel lanes to eastbound and westbound I-84 to provide at least three lanes of travel in each direction. Improvements are only proposed at Interchanges 3 and 7 on I-84. No improvements are proposed at the remaining interchanges on I-84.

* Advancing Map Summary SheetStoryboard

Concept 2

Concept 2 seeks to improve congestion and mobility by constructing eastbound and westbound collector distributor (CD) roads in the center section of the corridor.

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Concept 2: Collector Distributor Roads – Mainline

Concept 2 seeks to improve congestion and mobility by constructing eastbound and westbound collector distributor (CD) roads in the center section of the corridor.

* Advancing Map 1 Map 2 Summary Sheet

Concept 3

Concept 3 seeks to improve access to Danbury Hospital and Downtown through a series of improvements in the center section of the corridor. There are six variations of Concept 3, named C3-1 through C3-6.

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Concept 3

Concept 3 seeks to improve access to Danbury Hospital and Downtown through a series of improvements in the center section of the corridor. There are six variations of Concept 3, named C3-1 through C3-6.All C3 concepts except for C3-4 provide a partial solution. They improve access to the hospital and downtown via Tamarack Avenue, but do not address congestion and mobility on the highway. These concepts can be constructed using typical methods. C3-4 was considered infeasible based on design standards for interchange spacing and was dismissed from further consideration.

The level of environmental impact varies between the C3 concepts. C3-1, C3-2, C3-3, and C3-5 have a high probability of disturbing active burial sites, requiring relocation of the remains and above-ground headstones and footstones at the Immanuel Lutheran Church Cemetery. However, C3-6 has no impact to the Immanuel Lutheran Church Cemetery and has a low probability of causing significant or irreparable harm to the natural or human environment.

As a result, C3-6 is considered the best performing concept and it is recommended that C3-6 be combined with a concept that addresses congestion and mobility on the highway.

* Advancing Map 1 Map 2 Map 3 Map 4 Map 5 Map 6 Summary Sheet

Concept 4

Concept 4 seeks to identify potential transit options that would improve mobility and increase transportation options for the traveling public in the I-84/Route 7 corridor in Danbury and its neighboring towns.

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Concept 4

Concept 4 seeks to identify potential transit options that would improve mobility and increase transportation options for the traveling public in the I-84/Route 7 corridor in Danbury and its neighboring towns. This analysis provides a broad regional view of the mobility needs that affect traffic patterns in the Danbury area and evaluates transit options that have potential to serve the key transit markets.

Transit options were explored and evaluated for their ability to:

• Reduce vehicular congestion on highway and local roads.
• Improve mobility along the corridor and in the region.
• Provide better access for transit dependent communities.
• Complement existing transit services.
• Support economic and transit-oriented development opportunities.

* Advancing Summary Sheet

Concept 5

Graphical drawing on Concept 5

Concept 5 seeks to replace left hand ramps with right hand ramps at the I-84 and Route 7 interchanges. This concept endeavors to maintain the current alignment of I-84 and stay within the existing right-of-way to the greatest extent possible.

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Concept 5: Route 7 Left to Right Hand Ramps - Mainline

Graphical drawing on Concept 5

Concept 5 seeks to replace left hand ramps with right hand ramps at the I-84 and Route 7 interchanges. This concept endeavors to maintain the current alignment of I-84 and stay within the existing right-of-way to the greatest extent possible.

* Not Advancing Map Summary Sheet

Concept 6

Graphical drawing on Concept 6

Concept 6 seeks to improve vehicular travel conditions in the vicinity of Interchanges 3 and 4.

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Concept 6: Interchange 3 and 4 - Segar St Ramp Eastbound

Graphical drawing on Concept 6

Concept 6 seeks to improve vehicular travel conditions in the vicinity of Interchanges 3 and 4.

* Advancing Map Summary Sheet

Concept 7

Graphical drawing on Concept 7

Concept 7 seeks to straighten the I-84 alignment in the vicinity of Interchanges 2 and 4. Two subconcepts, a tunnel and an open-cut section, are considered on I-84 on the west side of the project corridor.

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Concept 7: Tunnel and Open Cut-West

Graphical drawing on Concept 7

Concept 7 seeks to straighten the I-84 alignment in the vicinity of Interchanges 2 and 4.  Two subconcepts, a tunnel and an open-cut section, are considered on I-84 on the west side of the project corridor.

Subconcept C7-1 will include base improvements plus:

  • A tunnel that is approximately one-half mile in length; the remainder of the realigned I-84 will be an open-cut section.
  • 6 new bridges will be constructed, and 7 existing bridges will be replaced.

Subconcept C7-2 will include the base improvements plus:

  • Entire re-aligned I-84 as an open-cut section.
  • 7 new bridges will be constructed, and 7 existing bridges will be replaced.
* Not Advancing Map 1 Map 2 Summary Sheet

Concept 8

Concept 8 would lower I-84 to be below grade between Interchanges 2 and 8. The CD Road traffic will be above grade and at the same elevation as existing I-84. Four construction methods of lowering I-84 were investigated for feasibility.

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Concept 8

Concept 8 would lower I-84 to be below grade between Interchanges 2 and 8. The CD Road traffic will be above grade and at the same elevation as existing I-84. Four construction methods of lowering I-84 were investigated for feasibility.

* Not Advancing Map Summary Sheet

Concept 9

Graphical drawing on Concept 9

Concept 9 seeks to create lane continuity, eliminate left-hand ramps, and, where possible, improve horizontal curvature. This concept maintains the current alignment of I-84 and separates Route 7 vehicles from those on I-84.

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Concept 9: Route 7 Median - Mainline

Graphical drawing on Concept 9

Concept 9 seeks to create lane continuity, eliminate left-hand ramps, and, where possible, improve horizontal curvature. This concept maintains the current alignment of I-84 and separates Route 7 vehicles from those on I-84.

* Advancing Map Summary SheetStoryboard

Concept 10

Graphical drawing on Concept 10

Concept 10 seeks to provide a new two-lane on-ramp from Route 7 southbound to I-84 westbound. The proposed improvement to the Route 7 southbound on-ramp to I-84 westbound results in changing the ramp configuration for the Route 7 southbound on-ramp to I-84 eastbound. The Route 7 southbound on-ramp to I-84 eastbound will be changed from an exit-only ramp to a typical exit ramp.

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Concept 10: Interchange 7 – Route 7 Ramp - Westbound

Graphical drawing on Concept 10

Concept 10 seeks to provide a new two-lane on-ramp from Route 7 southbound to I-84 westbound. The proposed improvement to the Route 7 southbound on-ramp to I-84 westbound results in changing the ramp configuration for the Route 7 southbound on-ramp to I-84 eastbound. The Route 7 southbound on-ramp to I-84 eastbound will be changed from an exit-only ramp to a typical exit ramp.

* Advancing Map Summary Sheet

Concept 11

Concept 11 seeks to provide improvements to the center section of I-84 within the project corridor.

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Concept 11

Concept 11 seeks to provide improvements to the center section of I-84 within the project corridor. The CD Road will be at the same elevation as I-84. This concept for a CD Road was developed to establish local connectivity and access to key destinations in downtown. The existing interchanges at Main Street and North Street are eliminated and the CD Road provides connections to Main Street, North Street, and Tamarack Avenue.

* Not Advancing Map Summary Sheet

Concept 12

Graphical drawing on Concept 12

Concept 12 seeks to provide improvements at Interchanges 3 and 4 on I-84 in the eastbound direction with a collector distributor (CD) road starting at the merge of the Lake Avenue off-ramp and the Route 7 northbound on-ramp and ending at the merge with I-84 eastbound (about 1,200 feet in length).

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Concept 12: Interchanges 3 and 4 CD Road – West

Graphical drawing on Concept 12

Concept 12 seeks to provide improvements at Interchanges 3 and 4 on I-84 in the eastbound direction with a collector distributor (CD) road starting at the merge of the Lake Avenue off-ramp and the Route 7 northbound on-ramp and ending at the merge with I-84 eastbound (about 1,200 feet in length).

* Advancing Map Summary Sheet

Concept 13

Concept 13 seeks to provide a new partial interchange on I-84 at Great Plains Road in the center section of the corridor.

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Concept 13

Concept 13 seeks to provide a new partial interchange on I-84 at Great Plains Road in the center section of the corridor. The Great Plains Road interchange will improve access between I-84 and the Danbury Hospital for points west of the Hospital.

* Advancing Map Summary Sheet

Concept 14

Concept 14 seeks to improve congestion and mobility by constructing an eastbound collector distributor (CD) road between Interchanges 7 and 8 to eliminate the weaving condition. I-84 will be three lanes in each direction between Interchanges 7 and 8.

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Concept 14

Concept 14 seeks to improve congestion and mobility by constructing an eastbound collector distributor (CD) road between Interchanges 7 and 8 to eliminate the weaving condition. I-84 will be three lanes in each direction between Interchanges 7 and 8.

* Advancing Map Summary Sheet

Concept 22

Concept 22 seeks to improve congestion and mobility by creating I-84 has express lanes in both directions in the median section between Interchanges 3 and 8.

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Concept 22

Concept 22 seeks to improve congestion and mobility by creating I-84 has express lanes in both directions in the median section between Interchanges 3 and 8.

* Advancing Map Summary Sheet