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I-83 EXIT 4 IMPROVEMENTS The proposed improvements are at the Exit 4 Interchange of Interstate 83 (I-83) and Route 851 in Shrewsbury Township. The area surrounding the interchange has seen extensive growth that the existing interchange can no longer accommodate. There are high levels of congestion, traffic backs up onto I-83 and the bridge carrying I-83 traffic over Route 851 is structurally deficient. The purpose of the project is to ease congestion, increase capacity, and improve safety for motorists and pedestrians, by constructing a diverging diamond interchange (DDI). A diverging diamond interchange (DDI) is unique from a standard diamond interchange in that the side road traffic Route 851 crosses to the left side of the road at a signalized intersection prior to the bridge. This allows direct left turns from the off-ramps to Route 851 and allows for a direct left turn on to the on-ramps to I-83. The side road (Route 851) traffic crosses back to the right side of the road at a signal beyond the bridge. The DDI configuration has an operational advantage over the standard diamond in that it has only 2 phases per signal cycle versus 3 phases. This allows the DDI to provide more green time to traffic, alleviating congestion. Additionally, because of the direct left turns, there are fewer conflict points than a standard diamond, which reduces the crash rate and crash severity. As of April 2018, 96 diverging diamond interchanges (DDIs) have been opened to traffic in the United States. PennDOT constructed its first DDI on I-70 at US 19 near Washington, PA. The I-83 Exit 4 Project is anticipated to be the second DDI to be constructed in Pennsylvania. PROJECT TIMELINE Please note that the dates shown are subject to change based on funding availability and receiving design and permitting approvals. PROJECT OBJECTIVES Eliminate traffic back-ups on the ramps from I-83 to improve safety Increase capacity and reduce congestion though the project area on Route 851 Replace structurally deficient bridge on I-83 Improve roadway to allow trucks to negotiate interchange safely and efficiently For Further Information: PennDOT Project Manager Mark Malhenzie Senior Project Manager PA Department of Transportation, District 8 Highway Design Unit 2140 Herr Street Harrisburg PA 17103-1699 717-783-5080 [email protected] Design Project Manager David Hamlet, P.E. Project Manager Gannett Fleming, Inc. P.O. Box 67100 Harrisburg, PA 17106-7100 717-763-7211 x2329 [email protected] Lengthen acceleration and deceleration lanes on I-83 ramps to improve safety Improve roadway signage to reduce driver confusion HOW DDI WORKS

HOW DDI WORKS I-83 EXIT 4 IMPROVEMENTS - PennDOT · I-83 EXIT 4 IMPROVEMENTS The proposed improvements are at the Exit 4 Interchange of Interstate 83 (I-83) and Route 851 in Shrewsbury

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Page 1: HOW DDI WORKS I-83 EXIT 4 IMPROVEMENTS - PennDOT · I-83 EXIT 4 IMPROVEMENTS The proposed improvements are at the Exit 4 Interchange of Interstate 83 (I-83) and Route 851 in Shrewsbury

I-83 EXIT 4 IMPROVEMENTS

The proposed improvements are at the Exit 4 Interchange of Interstate 83 (I-83) and Route 851 in Shrewsbury Township.

The area surrounding the interchange has seen extensive growth that the existing interchange can no longer accommodate. There are high levels of congestion, traffic backs up onto I-83 and the bridge carrying I-83 traffic over Route 851 is structurally deficient.

The purpose of the project is to ease congestion, increase capacity, and improve safety for motorists and pedestrians, by constructing a diverging diamond interchange (DDI).

A diverging diamond interchange (DDI) is unique from a standard diamond interchange in that the side road traffic Route 851 crosses to the left side of the road at a signalized intersection prior to the bridge. This allows direct left turns from the off-ramps to Route 851 and allows for a direct left turn on to the on-ramps to I-83. The side road (Route 851) traffic crosses back to the right side of the road at a signal beyond the bridge.

The DDI configuration has an operational advantage over the standard diamond in that it has only 2 phases per signal cycle versus 3 phases. This allows the DDI to provide more green time to traffic, alleviating congestion. Additionally, because of the direct left turns, there are fewer conflict points than a standard diamond, which reduces the crash rate and crash severity.

As of April 2018, 96 diverging diamond interchanges (DDIs) have been opened to traffic in the United States. PennDOT constructed its first DDI on I-70 at US 19 near Washington, PA. The I-83 Exit 4 Project is anticipated to be the second DDI to be constructed in Pennsylvania.

PROJECT TIMELINE

Please note that the dates shown are subject to change based on funding availability and receiving design and permitting approvals.

PROJECT OBJECTIVES Eliminate traffic back-ups on the

ramps from I-83 to improve safety

Increase capacity and reduce

congestion though the project area

on Route 851

Replace structurally deficient

bridge on I-83

Improve roadway to allow trucks

to negotiate interchange safely and

efficiently

For Further Information: PennDOT Project Manager

Mark Malhenzie Senior Project Manager

PA Department of Transportation, District 8 Highway Design Unit 2140 Herr Street Harrisburg PA 17103-1699

717-783-5080 [email protected]

Design Project Manager

David Hamlet, P.E. Project Manager

Gannett Fleming, Inc. P.O. Box 67100 Harrisburg, PA 17106-7100 717-763-7211 x2329 [email protected]

Lengthen acceleration and

deceleration lanes on I-83 ramps to

improve safety

Improve roadway signage to reduce

driver confusion

HOW DDI WORKS

mailto:[email protected]
mailto:[email protected]
Page 2: HOW DDI WORKS I-83 EXIT 4 IMPROVEMENTS - PennDOT · I-83 EXIT 4 IMPROVEMENTS The proposed improvements are at the Exit 4 Interchange of Interstate 83 (I-83) and Route 851 in Shrewsbury

DIVERGING DIAMOND INTERCHANGE (DDI)

PROJECT OPTIONS

The result of a mini study conducted in 2015, with input from municipal, county, and state stakeholders during the public involvement process, was a decision to study further a 4-lane diverging diamond interchange beneath a new two-span bridge and a 4-lane tight diamond interchange beneath a new two-span bridge. These two options were taken into preliminary engineering for further analysis and comparison. The results were presented at a public meeting on March 30, 2016. The DDI was selected as the design to move forward after receiving positive public feedback on its benefits.

RECOMMENDATION Construct Diverging Diamond Interchange

The Diverging Diamond (DDI):

• Significantly increases the capacity of left and right turning movements to and from the ramps.

• Requires only two-phase traffic signals with short cycle lengths, reducing delay.

• Significantly better at handling left turn movements under the bridge.

• Has better performance and offers lower delays, fewer stops, lower stop time and shorter queue lengths when compared to the performance of the conventional diamond design.

• Can handle steady growth of traffic volumes with acceptable traffic operations through year 2060, 10 years beyond the tight diamond interchange.

• Is easier to expand with additional turn lanes in the future than the tight diamond interchange option if growth exceeds projections.

• Substantially reduces the number of conflicts compared to the tight diamond interchange points, improving safety.

ts Tight Diamond Interchange

Diverging Diamond Interchange

Crossing Merging Diverging

Crossing 10 2

Merging 8 6

Diverging 8 6

TOTAL 28 14

TIGHT DIAMOND INTERCHANGE (TDI)


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