I-375 IMPROVEMENT PROJECT Purpose & Need€¦ · the I-375 Alternatives Study, identiﬁed a Purpose and Need for the project and developed six Illustrative Alternatives to address

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CONTACT [email protected]

I-375 IMPROVEMENT PROJECT

Purpose & NeedPROJECT PURPOSE

The purpose is to identify a transportation improvement alternative that will:

Address functionally obsolete interchange design, deteriorated bridges and roadway with an appropriate solution which considers safety, operations and long-term life-cycle costs.

Address existing and future transportation needs and roadway safety for all users.

Improve connectivity to surrounding areas for both vehicular and non-motorized users, and enhance connections to existing and planned transit services which may result in improved community health.

Enhance access to enable future development and other place-making opportunities envisioned in official land use and long-term economic development plans.

PROJECT NEED

The proposed project will address the following needs:

Deteriorated bridges crossing I-375, which are over 50 years old, and deteriorated pavement conditions.

Outdated existing geometric conditions, such as ramp widths and sharp curvature at the south end of the corridor, along with insufficient weave/ merge areas, which result in elevated crash rates and increased congestion.

Lack of a direct connection for vehicles and pedestrians to the developing East Riverfront from the I-375 corridor.

Poor connectivity and confusing access to downtown destinations through the I-75/I-375 interchange and Gratiot Avenue connector. Operational congestion and safety issues along the Jefferson Avenue corridor west of I-375 due to high volumes and inefficient left turning movements.

Poor environment in I-375 and Jefferson Avenue corridors for transit and non-motorized travel, including long pedestrian crossing distances, lack of bike facilities, and poor connectivity to existing transit services.




Screening Process2014 PLANNING AND ENVIRONMENTAL LINKAGES STUDY

Refinements made based on public feedback and detailed technical environmental analysis

6 ILLUSTRATIVE ALTERNATIVES

2 PRACTICAL ALTERNATIVES

The 2014 Planning and Environmental Linkages (PEL) Study, the I-375 Alternatives Study, identified a Purpose and Need for the project and developed six Illustrative Alternatives to address those needs.

The study included community outreach and technical analysis of traffic operations and safety, with the intention that these efforts will meet the NEPA requirements.

The six Illustrative Alternatives from the 2014 PEL Study were studied further. A screening process based on the Purpose and Need was completed to narrow down the six Illustrative Alternatives to two Practical Alternatives.

WE ARE HERETwo Practical Alternatives were selected following the Illustrative Alternative screening. These alternatives will be further refined after we receive public feedback.

1 PREFERRED ALTERNATIVE

MDOT will hold a public hearing to present the social, economic, and environmental impacts of the two Practical Alternatives that will ultimately lead to a decision of the Preferred Alternative.

Illustrative Alternatives developed from the 2014 PEL Study

AlternativesScreening by thetechnical team




Screening Results

Meets the Purpose & Need

1 2 3ILLUSTRATIVE ALTERNATIVES 4 5 6

Best Serves the Needs of Non-Motorized Users

Easiest to Build and Maintain

Enables Economic Development & Placemaking

6Illustrative

Alternatives

ScreeningProcess

2Practical

AlternativesSix Illustrative Alternatives from

the 2014 PEL Study were examinedA screening process scored howeach Illustrative Alternative met

the project’s Purpose & Need

Two Practical Alternatives were developed from the highest scoring

Illustrative Alternatives (4&5)keyboard_arrow_right keyboard_arrow_rightkeyboard_arrow_down



!"#$375

!"#$75

!"#$75

I-375 NB

/SB

No-BuildBoulevard

© OpenStreetMap (and) contributors, CC-BY-SA

123=

1237

1239aa

D e t r o i t R i v e r

C A N A D AC A N A D A

Legend

I-375 NB/SB

¯Data is assumed to be similar tothat of Practical Alternative 4

0 0.125 0.25Miles


Travel TimesMORNING TRAVEL TIMES (MINUTES)

Minutes

No-Build 5.2 Minutes

7.5 Minutes

4.8 Minutes

7.8 Minutes

3.1 Minutes

6.4 Minutes

5.2 Minutes

5.7 Minutes

Boulevard

No-Build

Boulevard

0 2 4 6 8 10

AFTERNOON TRAVEL TIMES (MINUTES)

Minutes

No-Build

Boulevard

No-Build

Boulevard

0 2 4 6 8 10

2 minutes slowerthan No-Build


1 minute fasterthan No-Build


I-375 to/from Chrysler Freeway

INBOUNDCHRYSLER FREEWAY TO I-375

PEAK DIRECTION

OUTBOUNDI-375 TO CHRYSLER FREEWAY

INBOUNDCHRYSLER FREEWAY TO I-375

OUTBOUNDI-375 TO CHRYSLER FREEWAY

PEAK DIRECTION



!"#$375

!"#$75

!"#$75

I-375 <> I-75

No-BuildBoulevard


123=

1237

1239aa

123=



Legend

I-375 NB to I-75 WBI-75 EB to I-375 SB


0 0.125 0.25Miles


Travel Times

INBOUNDFISHER FREEWAY to I-375 SB

PEAK DIRECTION

OUTBOUNDI-375 NB to FISHER FREEWAY

Minutes


11.1 Minutes

5.5 Minutes

8.3 Minutes

4.1 Minutes

12.1 Minutes

5.8 Minutes

6.3 Minutes

Boulevard

No-Build

Boulevard

0 2 4 6 8 10 12 14 16

2 4 6 8 10 12 14 160

INBOUNDFISHER FREEWAY to I-375 SB

OUTBOUNDI-375 NB to FISHER FREEWAY

PEAK DIRECTION

Minutes

No-Build

Boulevard

No-Build

Boulevard


6 minutes fasterthan No-Build

1 minute fasterthan No-Build


I-375 to/from Fisher FreewayMORNING TRAVEL TIMES (MINUTES)




!"#$375

!"#$75

!"#$75

Gratio

t EB/W

B


1239



Legend

Gratiot EB/WB


0 0.125 0.25Miles


Travel Times

Minutes


5.5 Minutes

2.5 Minutes

2.4 Minutes

2.4 Minutes

3.0 Minutes

2.4 Minutes

3.0 Minutes

Boulevard

No-Build

Boulevard

0 2 4 61 3 5

1 3 5Minutes

No-Build

Boulevard

No-Build

Boulevard

0 2 4 6


Similartravel times

Similartravel times

Similartravel times

Inbound/Outbound Gratiot

INBOUNDGRATIOT

PEAK DIRECTION

OUTBOUNDGRATIOT

INBOUNDGRATIOT

OUTBOUNDGRATIOT

PEAK DIRECTION

MORNING TRAVEL TIMES (MINUTES)




!"#$375

!"#$75

!"#$75

To/From G

reektown

Parking Garage

No-BuildBoulevard


123= 1239aa



Legend

To/From GreektownParking Garage


0 0.125 0.25Miles


Travel Times

Minutes

0.9 Minutes

1.9 Minutes

1.0 Minutes

1.8 Minutes

1.0 Minute

0.5 Minutes

2.1 Minutes

1.5 Minutes

Boulevard

Boulevard

0 1 2 3 4

Minutes

Boulevard

No-Build

No-Build

No-Build

No-Build

Boulevard

0 1 2 3 4

1 minute slowerthan No-Build




Greektown to/from I-375

INBOUNDI-375 SB TO GREEKTOWN

PEAK DIRECTION

OUTBOUNDGREEKTOWN TO I-375 NB

INBOUNDI-375 SB TO GREEKTOWN

OUTBOUNDGREEKTOWN TO I-375 NB

PEAK DIRECTION

MORNING TRAVEL TIMES (MINUTES)


Documents

I-375 IMPROVEMENT PROJECT Purpose & Need€¦ · the I-375 Alternatives Study, identiﬁed a Purpose and Need for the project and developed six Illustrative Alternatives to address