HomeMy WebLinkAbout09/10/2020 - Langan Memorandum - Addendum to Traffic Impact and Access Study - - AIVEiA /V
555 Long Wharf Drive New Haven,CT 06511 T:203.562.5771 F:203.789.6142
TO: Jean Enright/North Andover Planning Director
FROM: Luke Mauro, PTOE
John Plante, P.E.
CC: Mac Utsey/Hillwood
DATE: , 2020
RE: 1600 Osgood Street
North Andover, Massachusetts
Addendum to Traffic Impact and Access Study
Langan Project No.: 140182701
Langan has prepared this memorandum to support revisions to the site plan resulting from the
permit process with MassDOT, including those comments described in a certain letter issued to
Mr. Mac Utsey, Hillwood Enterprises, LP, from Paul D. Stedman, District 4 Highway Director,
MassDOT, dated July 30, 2020 (the_"MassDOT Mitigation Letter"). MassDOT is requesting
certain off-site improvements and driveway management that requires revisions to the site plan.
This memorandum describes the modifications to the site plan that impact vehicular access
from Osgood Street, internal circulation and adjustment to the Traffic Impact and Access Study
dated March 2020 by Langan.
Previously Approved Improvements
The approved development reconfigured the property into two separate lots, including Lot A and
Lot B, with no vehicular access between the lots, except for the common driveway approved for
the North (signalized) Access Road. In order to provide a comparison of the requested
MassDOT revisions to the previously approved site plan, the following describes the traffic
mitigation and access/egress originally approved:
North Signalized Driveway
The north signalized driveway was proposed to include the following improvements:
Provide new signal equipment for full operation and coordinate timing with the
development's southernmost driveway.
Optimize the timings for these two coordinated signals at the development's driveways
during both the weekday morning and evening peak period.
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North Unsignalized Driveway
The unsignalized north central driveway serving existing building nos. 20 and 21 was proposed
to be maintained in the existing condition.
South Unsignalized Driveway
The unsignalized south central driveway serving existing building nos. 20 and 21 was proposed
to be maintained in the existing condition.
South Signalized Driveway
The south signalized driveway was proposed to include the following improvements:
- Provide new signal equipment and construct an exclusive northbound left-turn lane with
350' of storage.
- Restripe the southbound right-turn only lane to a shared through/right-turn lane, shift the
southbound shared left-turn/through lane west, and provide a striped median to provide
adequate room for re-alignment.
Proposed Improvements
MassDOT is requesting certain off-site improvements and driveway management that impact
the site plan and access/egress as described in the MassDOT Mitigation Letter.
Off-Site Improvements
The following items have been incorporated into the mitigation program for the proposed
development along the projects frontage:
- Provide a MBTA standard bus bay and bus shelter on the west side of Osgood Street
(Route 125) to service the Merrimack Valley Regional Transportation Authority
(MVRTA).
- Construct a 12-foot wide shared-use-path extending from the North Signalized Driveway
to the South Signalized Driveway along the west side of Osgood Street (Route 125).
- Mill and overlay of Osgood Street (Route 125) within the area of widening.
North Signalized Driveway
In addition to the previously approved improvements, the following are proposed at the north
signalized driveway:
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- Provide addition of northbound left-turn lane with 250 feet of storage.
- Widen southbound approach to the intersection to provide a striped median to offset
from northbound left-turn lane.
- Provide crosswalk striping and signage to connect the proposed shared-use-path to a
receiving ramp on the north side of the driveway.
- Provide a sidewalk along the southern side of the driveway connecting to a sidewalk in
the office parking lot for the portion of Lot A, servicing Building Nos. 20 and 21.
North �Unsignalized Driveway
The following are proposed at the unsignalized north central driveway on Lot A:
nvert driveway to a - -
turn out gDly.
Install channelization island.
Provide crosswalk striping and signage to maintain shared-use-path access through the
driveway to a receiving ramp on the south side of the driveway.
final confi rocess and_May_
The modifications above will be determi The
without the connector drive and the noftherly
South w Unsignalized Driveway
The following are proposed at the unsignalized south central driveway on Lot A:
Convert driveway to a right- in/right-turn out e only.
Pa channelization island
Crosswalk striping and signage to maintain shared-use-path access through the
driveway.
South Signalized Driveway
In addition to the previously approved improvements, the following are proposed at the south
signalized driveway:
Provide a southbound left-turn lane with 125' of storage.
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Provide crosswalk striping and signage along the west side of Osgood Street (Route
125) for the shared-use-path and a crosswalk on the south side of the Osgood Street
(Route 125) & South Driveway intersection to provide pedestrian access to the east side
of Osgood Street (Route 125).
On-Site Revisions
The MassDOT requested access/egress management necessitates revisions to the site
circulation.
- Provide a driveway connection between the southern signalized driveway (currently
serving Lot B only) and the driveway serving existing Building Nos. 20 and 21, allowing
vehicles in the southern side of the parking lot serving existing Building Nos. 20 and 21
on Lot A to access a signal controlled intersection. The proposed driveway connection
has been located outside the limit of the peak hour eastbound queue length. The Lot A
parking lot connector driveway will be stop sign controlled, and will include- "Do Not
Block The Box" pavement marking and signage to prevent vehicles from obstructing
movements in and out of the connector driveway.
- Provide a driveway connection between the North signalized)
(currently Lot B
only) and the parking lot serving existing Building Nos. 20 and 21 on Lot A, allowing
vehicles in the northern side of the parking lot serving existing Building Nos. 20 and 21
to access a signal controlled intersection. The proposed driveway connection has been
located outside the limit of the peak hour eastbound queue length. The Lot A parking lot
connector driveway will be stop sign controlled, and will include both "Do Not Block The
Box" pavement marking and signage to prevent vehicles from obstructing movements in
and out of the connector driveway.
- Provide adjustments to some curb radii to facilitate truck and emergency vehicle
circulation within the parking lots serving existing Building Nos. 20 and 21 on Lot A.
- Rearrange parking spaces on Lot A to accommodate the geometric adjustments. The
total number of parking and loading spaces remains the same.
Supporting Analysis
The signalized driveways have been evaluated to verify that the rerouting of vehicles via the
proposed office connections provide acceptable traffic signal operation. Figures 1 through 6
show the existing, no-build, and build peak-hour traffic volumes for the roadway peak and
generator peak periods. These figures were used as a basis for the following analyses.
North Access Driveway/Lot A Driveway Connection
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Langan Project No.: 140182701
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Langan evaluated the traffic impact on the north signalized driveway resulting from the
connecting driveway. As discussed above, the north central unsignalized driveway 4'6--RA9W-
pf-ep�)6LM be restricted
to 4 ®® right- - movement only.
All left-tu; exiting * the north central unsignalized driveway
were re-routed to enter and exit ®r at the north signalized driveway®
® tilize the north connection to Lot A. To
accommodate these movements, a northbound left-turn lane was added to Osgood Street
ra
Inalized drivgWay. Tables 1 through 4
below compare the previously submitted analysis results with the revised capacity analysis. As
shown in the tables, acceptable or previously submitted levels-of-service were maintained with
the connection between the parking lot serving existing Building Nos. 20 and 21 on Lot A and
the north signalized driveway (See the attached capacity analysis reports).
In addition to verifying that the proposed operation of the intersection of Osgood Street and the
north signalized driveway was acceptable, Langan also verified that the exiting queues would
not overlap with the proposed on-site office connection intersection. The proposed on-site office
connection is located approximately 295 feet behind the eastbound approach stop bar. Tables 1
through 4 indicates that the maximum exiting queue length with the office connection is
approximately 145 feet. A "Do Not Block The Box" pavement marking and signage are
proposed.
Langan also evaluated the intersection sight distance (ISD) for the north connection intersection
to determine if the available intersection sight distances meet the minimum requirements
established by the American Association of State Highway and Transportation Officials
(AASHTO) as outlined in A Policy on Geometric Design of Highways and Streets, 6th Edition
(also known as the AASHTO Green Book). As shown in Table 5, the north connection
intersection ISDs provided at the site driveways meet AASHTO's minimum requirements. Note,
if necessary, revisions to the previously approved landscaping plan will be made to provide the
sight triangles.
South Access Driveway/Lot A Driveway Connection
Langan evaluated the traffic impact on the south signalized driveway resulting from the
connecting driveway from Lot A. As discussed above, the south central driveway as it meets
Osgood Street is now proposed to limit vehicles to right-in/right-out movements only. The left-
turning exiting vehicles from the south central unsignalized driveway were re-routed to exit the
development at the south signalized driveway. 100% of previously submitted entering and
exiting left-turns have been re-routed to enter/exit as left-turns via the south signalized driveway.
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Langan Project No.: 140182701
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Inbound vehicles turning left into the south central driveway were rerouted to turn left into the
south signalized driveway. In addition to the connection, a south left-turn lane was added to
Osgood Street and was incorporated into the revised analysis. Minor signal timing optimization
was required to balance the proposed traffic volumes. Tables 1 through 4 below compare the
previously submitted analysis results with the revised capacity analysis. As shown in the tables,
acceptable or previously submitted levels-of-service were maintained with the connection
between the office parking lot and the south signalized driveway (See the attached capacity
analysis reports).
In addition to verifying that the proposed operation of the intersection of Osgood Street and the
south signalized driveway was acceptable, Langan also verified that the exiting queues would
not overlap with the proposed on-site Lot A connection intersection with the South Signalized
Access Drive. The proposed on-site connection is located approximately 325 feet behind the
eastbound approach stop bar. Tables 1 through 4 indicates that the maximum exiting queue
length with this connection is approximately 46 feet. A "Do Not Block The Box" pavement
marking and signage are proposed.
Langan also evaluated the intersection sight distance (ISD) for the south connection intersection
to determine if the available intersection sight distances meet the minimum requirements
established by the American Association of State Highway and Transportation Officials
(AASHTO) as outlined in A Policy on Geometric Design of Highways and Streets, 6th Edition
(also known as the AASHTO Green Book). As shown in Table 5, the south office connection
intersection ISDs provided at the site driveways meet AASHTO's minimum requirements. Note,
if necessary, revisions to the previously approved landscaping plan will be made to provide the
sight triangles, which is limited to the relocation of street trees outside the proposed sight
triangles. Revised landscape plans will be provided under separate cover.
Conclusion
Based on the analysis, the proposed connections between the north and south signalized
intersections and the parking lot serving existing Building Nos. 20 and 21 on Lot A will operate
adequately and not have a negative impact on the traffic operating conditions. In addition to
these connections, the following items have been included in the proposed improvements
following ongoing coordination with MassDOT:
- North Signalized Driveway
o Provide addition of northbound left-turn lane with 250' of storage.
o Widen southbound approach to the intersection to provide a striped median to
offset from northbound left-turn lane.
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1SOODogood8�ee Addendum to Traffic Impact and Access Study
Langan Project No.: 14O1827U1
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o Provide crosswalk striping and oignege to connect the proposed shared-use-path
to a receiving ramp on the north side of the driveway.
o Provide e oidevve|h along the southern side of the driveway connecting to e
sidewalk in the office parking lot.
- North Gep#a4LInsignalized4 [)rivavvey
o nvert driveway
only.in/right-_turn out
o Install channo|izotion io|and�
o
o Provide crosswalk striping and signege to maintain shared-use-path access
through the driveway.
- South Gen#a44Unsignalized4 [)hvevvey
o Convert driveway toa right-turn in/right-turn utaccess only.
o ohenno|izetion island
o Provide or000vve|h striping and oignage to maintain shared-use-path eooeoo
through the driveway.
- South Signalized Driveway
o Provide addition ofoouthbound left-turn lane with 125' of storage.
~ Provide cnOSSVV8|k Striping and Sign8g8 along the VV8St side Of Osgood Street (Route
125) for the shared-use-path and e crosswalk on the south side of the Osgood Street
(Route 125) & South [)[iV8w8V intersection to provide-pedestrian 8CCeQS to the east side
of Osgood Street (Route 125).
- Off-Site Improvements
o Provide o M8TA standard bus boy and bus shelter on the vvoot side of Osgood
Street (Route 125\ to service the Merrimack Valley Regional Transportation
Authority (MVRTA).
o Construct a 12-foot wide shared-use-path extending from the North (Signalized)
Driveway to the South (Signalized) Driveway along the west side of Osgood
Street (Route 125).
o yWi|| and overlay of Osgood Street (Route 125)within the area of widening.
- On-Site Improvements
o Provide adjustments to some curb radii to facilitate truck and emergency vehicle
circulation within the office perking lots.
o Rearrange perking spaces on Lot Ato accommodate the geometric adjustments.
The total number of parking spaces remains the same.
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1600 Osgood Street
MEMO Revisions to Conceptual Off-site Improvements
Langan Project No.: 140182701
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