project description northbound interchange …sep 28, 2020 · i-91/i-691/ route 15 interchange...
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State Project No.: 0079-245Federal Aid Project No.: TBD
I-91/I-691/ Route 15 Interchange Improvements in Meriden, CT
1
PROJECT DESCRIPTIONInterchange Improvements to I-691 Eastbound Off-Ramp to I-91
Northbound
LOCATION:
This proposed project is located on a segment of Interstate 91 (I-91) that provides access to Route 15 (Wilbur Cross Parkway), Interstate 691 (I-691), and East Main Street in the City of Meriden. All three highways in the project area consist of a complex system of mainline lanes, weave sections and ramp connections that form the I-91/I-691/Route 15 Interchange. The improvements proposed as part of this project encompass highway elements along the northbound direction of I-91 and eastbound direction of I-691 within the limits as described below.
The proposed project limits begin on I-91 NB from the junction of the on-ramp from Route 15 NB (MP 19.6) to the Middletown rest area (MP 21.42) for approximately 1.8 miles.
The proposed project limits begin on I-691 EB off-ramp (MP 0.02) and extend to its junction with I-91 NB for approximately 0.4 miles.
PURPOSE AND NEED:
The purpose of this project is to reduce congestion for the traffic movement at the left-handed off-ramp from I-691 EB to I-91 NB and along I-91 NB mainline and address associated safety concerns within the proposed project limits. The project intends to complete the following:
Reduce traffic congestion to achieve a Level of Service (LOS) of D or better by design year 2051.
State Project No.: 0079-245Federal Aid Project No.: TBD
I-91/I-691/ Route 15 Interchange Improvements in Meriden, CT
2
Improve safety associated with crashes caused by congestion and weaving.
The proposed improvements consist of widening the off-ramp from I-691 EB to I-91 NB (Interchange no. 11) to two lanes and the construction of an operational lane on I-91 NB from the on-ramp from Interchange no. 11 s and the Middletown rest area.
EXISTING CONDITIONS:
I-691 Eastbound and Westbound
Within the project limits, I-691/Route 66 consists of two mainline lanes of travel in each direction. Access to I-91 NB (Interchange no. 11) consists of a single-lane left-hand off-ramp from I-691 EB that merges with a single-lane I-691 WB off-ramp prior to merging with I-91 NB.
The existing (year 2017) operating conditions along mainline I-691 eastbound and westbound are considered good based on a level of service “C” or better. Intermittent backups on the I-691 EB off-ramp prior to its merge with the I-691 WB off-ramp have been observed during the peak hours. Future 2051 traffic volumes are anticipated to increase considerably resulting in LOS “E” on I-691 EB downstream of the off-ramp to I-91 NB. The off-ramp from I-691 EB to I-91 NB is expected to operate at a LOS “F” in 2051.
I-91 Northbound
I-91 NB within the project limits consists of three mainline lanes of travel. North of its merge with Interchange No. 11 ramps (MP 20.41), the existing I-91 NB serves an AM peak hour volume of 5,150 vehicles that is expected to increase to approximately 6,170 vehicles in 2051. The single lane entrance ramp from I-691 currently has an AM peak hour volume of 1,700 vehicles is expected to increase approximately to 2,070 vehicles per hour in 2051.
Levels of service downstream of the on-ramp from I-691 on I-91 NB are anticipated to be “C” during the AM and PM peak periods in 2051. The level of service upstream of the Interchange No. 11 ramp reduces to a LOS “E” in 2051 due to the heavy traffic from the ramp and mainline I-91 NB resulting in traffic congestion and backups.
The I-91 NB segment between the I-691 Interchange No. 11 (MP 20.41) and the rest area off-ramp has three percent positive grade and high truck volume (around 10%) that results in slower traffic.
Crash History
The crash data between May 1, 2014 and April 30, 2017 indicated that there were a total of 63 crashes with 12 injuries (I-91 NB recorded 40 crashes with 8 injuries, I-691 EB to I-91 NB ramp recorded 11 crashes with 2 injuries and I-691 WB to I-91 NB ramp recorded 12 crashes with 2 injuries).
State Project No.: 0079-245Federal Aid Project No.: TBD
I-91/I-691/ Route 15 Interchange Improvements in Meriden, CT
3
The predominant types of crashes consist of the following:
I-91 NB I-691 EB (ramp to I-91 NB) I-691 WB (ramp to I-91 NB)Fixed Object – 37% Fixed Object – 64% Fixed Object – 83%Rear End – 35% Rear End – 27% Right Angle – 9%Sideswipe – 28% Sideswipe – 9% Sideswipe – 8%
The crash data show that the predominant types of crashes on the roadway segments can be attributed to congestion due to limited ramp capacity as well as to congestion on I-91 mainline.
Traffic Volumes
Maximum approximate peak hour volumes observed in the year 2017 and projected to the year 2051 for each highway corridor within the project area are as follows:
Year I-91 NB I-691 EB (ramp to I-91 NB) I-691 WB (ramp to I-91 NB)2017 5,370(5,350)* 1,620(1,560) 80(60)
2051 6,440 (6,430) 1,970(1,890) 100(70)
*AM Peak volume (PM Peak volume)
PROPOSED IMPROVEMENTS
I-691 Eastbound
It is proposed to widen the exit ramp from I-691 EB to I-91 NB to increase capacity and reduce congestion. Bridge No. 01837 will be widened due to the proposed improvements. The merge point of the I-691 EB and WB off-ramps will be re-aligned to improve traffic operations by providing additional storage and maneuverability for vehicles.
State Project No.: 0079-245Federal Aid Project No.: TBD
I-91/I-691/ Route 15 Interchange Improvements in Meriden, CT
4
I-91 Northbound
I-91 NB is proposed to be improved between the on-ramp from Route 15 NB and the Middletown Rest Area by adding an operational lane and widening Bridge No. 03051 (I-91 NB over Baldwin Avenue) to accommodate the additional mainline lane. The deck for this bridge is also proposed to be replaced.
No right-of-way impact is anticipated as part of this project.
ESTIMATED COSTS:
Construction ………………………………...$45 million (2023 Construction Year) ROW …………………………………………$0 Utilities ……………………………………….TBD Preliminary Engineering ……………………$25 million (Includes Project 79-240 and 79-246)
SCHEDULE (DESIGN/BUILD):
Design Approval………………………………………………… 02/16/2022 Procurement ............................................................................February 2022 Final Design Completion Date.................................................February 2023 Construction Completion Date................................................. 03/31/2025
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STATE PROJECT NO.:
CITY/TOWN:
DATE:
DEPARTMENT OF TRANSPORTATION
STATE OF CONNECTICUTC
ONNECTICUT
DE
PA
RT
ME
NT
O F TRANS
PO
RT
ATI
ON
06/23/2020
MERIDEN & MIDDLETOWN
LOCATION
PROJECT
0
HORIZONTAL SCALE
4000'2000'
1"=2000"
LOCATION MAP
I-691EB TO I-91NB IMPROVEMENTS
FIGURE 7