Item 9ACity of Southlake
Department of Planning
MEMORANDUM
February 8, 2002
TO: Honorable Mayor and City Council Members
FROM: Ken Baker, AICP, Senior Planner
SUBJECT: Resolution No. 02 -008 - Requesting that the State of Texas Department of Transportation
(TxDOT) provide the dedication of funds to design, engineer, and construct a direct roadway
connection (flyover) across SH 114 from the westbound SH 114 frontage road to FM 1709
to replace the Wall Street bridge.
Action Requested: Approve Resolution 02 -008 which requests that the State of Texas Department of
Transportation (TxDOT) provide the dedication of funds to design, engineer, and
construct a direct roadway connection (flyover) across SH 114 from the
westbound SH 114 frontage road to FM 1709 to replace the Wall Street bridge
that will be removed when the main lanes of SH 114 are reconstructed (Funnel
Project).
Background: Project Overview
The Texas Transportation Commission has agreed to provide $524 million in funding
to improve SH 114 and SH 121 through Grapevine and Southlake. The road
improvements are expected to improve the flow of traffic near the north end of the
Dallas/Fort Worth International Airport to SH 114 in Southlake. The area where SH
114, SH 121, Interstate 635 and F.M. 2499 converge and create a traffic bottle neck
is referred to as the 'funnel. " Hence, the project is referred to as the 'funnel
project' (See Attachment A). Construction on this project is not expected to begin
until 2005 at the earliest.
According to TXDOT, the 'funnel project" in the Southlake vicinity will consist
o£ 1) widening SH 114 to allow the construction new outside lanes in both the east
and west bound directions; and 2) constructing a four (4) lane median containing an
"express lane" in both directions along about a three (3) mile portion of SH -114 from
a point near the Baylor Hospital to the DFW airport. As a result of this project, the
existing Wall Street Bridge that connects the westbound SH 114 frontage/Wall
Street/Park Boulevard to FM 1709 will be removed when the main lanes of SH 114
are reconstructed. An alternative connection (Northwest Highway bridge) from
Northwest Highway in Grapevine to Gateway Boulevard in Southlake will be
constructed prior to the removal of the Wall Street bridge.
Disadvantages of TxDOT's Current Design Plans
The current TxDOT design plans which call for the removal of the Wall Street bridge
does benefit the City of Grapevine by limiting through traffic on Wall Street.
However, the removal of the Wall Street bridge results in a number of disadvantages
for the City of Southlake. The disadvantages of the current TxDOT design are as
follows (See Attachment B):
Direct access between westbound SH 114 frontage road and FM 1709 is removed
resulting in reduced west bound traffic volumes along the E. Southlake Boulevard
commercial corridor;
May require future ROW acquisition along Gateway Boulevard for future
realignment of FM 1709 to allow improved access to the Northwest Highway
bridge. This would likely impact some of the existing buildings in the Gateway
Plaza shopping center; and
High traffic volumes and turning movements at the Kimball Avenue and
Northwest Highway interchanges.
Development of Design Alternatives
As a result of the potential negative impact that the removal of the Wall Street bridge
may have on the City of Southlake, the Planning and Public Works Departments
contracted with Lee Engineering and requested that they develop three (3) design
alternatives. The consultant was instructed to develop designs alternatives that 1)
allowed continued direct access from to FM 1709 from the westbound SH 114
frontage road; and 2) would alleviate some of the traffic demands on the Kimball
Avenue and Northwest Highway interchanges.
Design
Alternatives: Alternative #1- One -way west bound bridge (Attachment C)
This alternative is similar to the existing bridge, but the bridge would be replaced with
a bridge allowing westbound traffic only. In addition, Wall Street traffic would be
restricted to a right turn in and right turn out only intersection with Park Boulevard.
The advantages of this configuration are as follows:
Maintains access to commercial property along FM 1709 from Park Boulevard
and SH 114.
• Reduces northbound SH 114 left turn volumes at the Northwest Highway and
Kimball Avenue interchanges.
• Allows southbound Park Boulevard traffic access to eastbound SH 114.
-2- Resolution 02 -008
2/12/02
The disadvantages are as follows:
• Requires the construction of an additional bridge.
• Prohibits access to Wall Street from Park Boulevard.
• Westbound left turn at SB SH 114 frontage road performs poorly.
Alternative #2 — Direct Connection - Flyover (Attachment D)
This alternative provides a direct connection (flyover) between the westbound SH 114
frontage road and FM 1709. Traffic at the westbound SH 114 frontage road/Park
Boulevard/Wall Street intersection would operate similar to the current TxDOT
design. The advantages of this configuration are as follows:
• Maintains access to commercial property along FM 1709 from the westbound
SH 114 frontage road.
• Reduces westbound SH 114 left turn volumes at the Northwest Highway and
Kimball interchanges.
• Maintains access to Wall Street from Park Boulevard.
The disadvantages are as follows:
• Requires the construction of an additional bridge.
• Westbound FM 1709 is only accessible from NB SH 114 frontage road.
Alternative #3 — One way (Westbound) Bridge with Park Boulevard Bridge
(Two (2) bridges)
This alternative is similar to alternative # 1, except an additional bridge is provided for
Park Boulevard traffic to access the southbound SH 114 frontage road without using
the westbound FM 1709. At the intersection of the Park Boulevard extension and the
southbound SH 114 frontage road, an acceleration lane for the Park Boulevard bridge
traffic is provided to allow a merging maneuver between the two roadways. The
advantages of this configuration are as follows:
• Maintains access to commercial property along FM 1709 from Park Boulevard
and SH 114.
• Reduces northbound SH 114 left turn volumes at the Northwest Highway and
Kimball interchanges.
-3 - Resolution 02 -008
2/12/02
• Increases access to /from SH 114 frontage roads for the cities of Grapevine and
Southlake, without impacting the main lanes of SH 114.
• Eliminates circuitous routing for southbound Park Boulevard to SH 114 traffic.
• Eliminates circuitous routing for SH 114 to WB FM 1709 traffic.
The disadvantages are as follows:
• Requires the construction of two (2) bridges.
Staff
Recommendation: Staff recommends that City Council adopt Resolution 02 -008 which requests TxDOT
provide the dedication of funds to design, engineer and construct a direct connection
(Alternative #2- Attachment D) between the westbound SH 114 frontage road and FM
1709. This alternative allows traffic on westbound SH 114 to continue to directly
access the commercial corridor along E. Southlake Boulevard and reduces traffic
volumes at the Kimball Avenue and Northwest bridge interchange areas. This
alternative also reduces the likelihood of realigning FM 1709 to allow improved
access to the Northwest Highway bridge. In addition, the design will eliminate
through traffic on to Wall Street.
Also, staff is recommending that the final alignment selected be indicated on the
Master Thoroughfare Map. This will serve to inform current and future citizens and
business owners of plans for this area.
Attachment A- Funnel Project
Attachment B- Current TxDOT Design
Attachment C- Alternative #1
Attachment D- Alternative #2
Attachment E- Alternative #3
Attachment F- Resolution 02 -008
Attachment G —Lee Engineering Technical Memorandum
KMB /kmb
Attachments (7)
-4- Resolution 02 -008
2/12/02
ATTACHMENT A
-5- Resolution 02 -008
2/12/02
ATTA H M E SIT B -
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- C - Resolution 02 -008
2/12/02
ATTACHMENT -
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-7- Resolution 02 -008
2/12/02
ATTACHMENT D-
ALTERNATIVE #2
Direct Access (Flyover) to FM
7109 from SH 114 Frontage
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Replacement of the Wall
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Resolution 02 -008
2/12/02
ATTACHMENT E-
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-9- Resolution 02 -008
2/12/02
RESOLUTION 02 -008
A RESOLUTION OF THE CITY COUNCIL OF SOUTHLAKE WHICH
REQUESTS THAT THE STATE OF TEXAS DEPARTMENT OF
TRANSPORTATION ( TXDOT) PROVIDE THE DEDICATION OF FUNDS
TO DESIGN, ENGINEER, AND CONSTRUCT A DIRECT CONNECTION
(FLYOVER) ACROSS SH 114 FROM THE WESTBOUND SH 114
FRONTAGE ROAD TO FM 1709 TO REPLACE THE WALL STREET
BRIDGE THAT WILL BE REMOVED WHEN THE MAIN LANES OF SH
114 ARE RECONSTRUCTED (FUNNEL PROJECT).
WHERAS, State Highway 114 represents the primary east —west means of access for all cities in
northeast Tarrant and southern Denton Counties; and
WHEREAS, the Wall Street bridge provides access to westbound FM 1709 (Southlake Boulevard)
from the westbound State Highway 114 frontage road and the City of Grapevine; and
WHEREAS, TXDOT plans to remove the current Wall Street in conjunction with the "Funnel
Project' in order to reconstruct the main lanes of State Highway 114; and
WHEREAS, TXDOT plans indicate that a new bridge will be constructed that connects Northwest
Highway to Gateway Boulevard and that the Wall Street bridge will not be replaced (See Exhibit #1); and
WHEREAS, the City of Southlake has a significant commercial corridor located along East
Southlake Boulevard near State Highway 114; and
WHEREAS, permanent removal of the Wall Street Bridge will reduce traffic volumes along the East
Southlake Boulevard commercial corridor and will adversely effect businesses located in this area; and
WHEREAS, permanent removal of the Wall Street Bridge will result in the elimination of the direct
access from the westbound State Highway 114 frontage road to FM 1709 and result in high traffic volume at
the Northwest Highway/Kimball Avenue interchange.
WHEREAS, R.O.W. requirements that may impact existing commercial establishments may be
required along FM 1709 /Gateway Boulevard to meet the design needs of the Northwest Highway bridge if
the Wall Street bridge is not replaced; and
WHEREAS, permanent removal of the Wall Street Bridge will result in the elimination of the direct
access from the westbound State Highway 114 frontage road to FM 1709 and result in high traffic volume at
the Northwest Highway/Kimball Avenue interchange.
NOW, THEREFORE, BE IT RESOLVED BY THE CITY OF SOUTHLAKE:
SECTION 1 : That all matters stated in the preamble are found to be true and correct and are
incorporated herein as if copied in their entirety.
_10- Resolution 02 -008
2/12/02
SECTION 2 : The City of Southlake formally requests that the State of Texas Department of
Transportation ( TxDOT) provide the dedication of funds to design, engineer, and construct a direct
connection (flyover) across SH 114 from the westbound SH 114 frontage road to FM 1709 to replace the
Wall Street bridge that will be permanently removed when the main lanes of SH 114 are reconstructed
SECTION 3 : The City of Southlake formally requests the timely dedication of funds by the Texas
Department of Transportation to complete design, engineering and construction of a flyover that directly
connects the westbound SH 114 frontage road to westbound FM 1709.
SECTION 4: The City Secretary is hereby directed to forward a copy of this resolution to the
District Engineer for TXDOT and TXDOT's Austin office.
PASSED AND APPROVED on this the day of 2002 by the City of
Southlake.
APPROVED:
Rick Stacy, Mayor
ATTEST:
Kim Bush, Acting City Secretary
Resolution 02 -008
2/12/02
EXHIBIT #1
Current Design
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Permanent Removal cuff
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This current T DOT design indicates the permanent
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Resolution 02 -008
2/12/02
EXHIBIT
Direct Access (Flyover) to FM
7749 from SH 114 Frontage
Replace rriert of the Wall
Street Bridge with an one -
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- 13 - Resolution 02 -008
2/12/02
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17440 DALLAS PARKWAY
SUITE
DALLAS,204 TEXAS 75287
972.248.3006 FAX 972.248.3855 Attachment G
LCL EncinEERinc
Technical Memorandum
TO: Charlie Thomas, P.E.
City of Southlake
FROM: Joseph T. Short, P.E. i714 f:/1
Lee Engineering, LLC
DATE: November 13, 2001
SUBJECT: FM 1709 at SH 114 Alternative Configuration Evaluation
Executive Summary
•
L The existing FM 1709 bridge over SH 114 is to be removed in order to reconstruct the main lanes of SH
114. A new bridge just north of the existing bridge is currently under construction and will connect
Northwest Highway to Gateway Boulevard. This change will impact access to the City of Southlake.
The new roadway patterns will bring large turning volumes to the Northwest Highway and Kimball
Avenue interchanges with SH 114.
As a way to alleviate some of the increased traffic demands on these interchanges, and to allow continued
access to FM 1709 from SH 114, alternative designs were considered. The alternative that provides the
most benefit to the area is the construction of a westbound only bridge that joins FM 1709 with the
northbound SH 114 frontage road/Park Boulevard/Wall Street intersection,as well as the construction
of a southbound Park Boulevard extension bridge that will join the southbound frontage road south of FM
1709. This alternative configuration will maintain access to FM 1709 from SH 114, as well as allow
improved operation of the Northwest Highway and Kimball Avenue interchanges with SH 114. This
alternative will improve operations of all traffic facilities in the area.
• Y t
INTRODUCTION
This technical memorandum documents the procedures and results of an evaluation of various alternative
configurations developed for the interchange of SH 114 and FM 1709 in Southlake, Texas. Various
alternative configurations were evaluated because current TxDOT design in the area requires the removal
of the existing bridge over SH 114 connecting FM 1709 in Southlake with Park Boulevard/Wall Street in
Grapevine. Under the proposed design, access from northbound SH 114 to westbound FM 1709 will be
provided by a bridge which connects Northwest Highway in Grapevine to Gateway Boulevard in
Southlake. The connection to FM 1709 is made by the intersection of Gateway Boulevard with FM 1709
at Commerce Street. Figure 1 in the appendix shows the proposed configuration in the study area.
Study Area
While the limits of the study area included the SH 114 corridor from Kimball Avenue to SH 26, the
primary focus was on the northbound SH 114 frontage road/Park Boulevard/Wall Street/FM 1709
interchange. Figure 2 in the appendix shows this study area, as well as the existing lane configurations.
STUDY PROCEDURE
The initial step in this study was to gather existing data. This data consisted of aerial photography of the
area, traffic volumes in the area, as well as plans for current and future construction to the major
roadways in the study area. -
The next step in this study was to identify alternatives to maintain access between FM 1709 and SH 114.
A description of each of the alternatives is provided later in this memorandum. Existing volumes
projected to 2010 were then assigned to each alternative.
The alternative configurations were then evaluated using PASSER-III,Synchro,and SimTraffic. In order
to perform a fair analysis of the alternatives, the majority of the parameters in the analysis were kept
constant across the alternatives. Using PASSER-III,the interchange between the SH 114 frontage roads
and Northwest Highway was optimized. The optimum cycle length found for the planned design was
then used as the basis for the optimization of the interchange in the other alternatives. In addition,the
cycle lengths at the other intersections were kept the same as much as possible. After the timings for the
interchange were developed in PASSER-III, the remaining intersections in the study network were
optimized using Synchro.
The number and location of signalized intersections varied slightly among the different alternatives. Lane
assignments were based on a "best case" basis. Based on operational needs, lanes were assigned to
provide the best operational performance for each alternative.
Finally, a preferred alternative was identified based on the results of these analyses.
FM 1709 at SH 114 Alternative Configuration Evaluation Page 2
Traffic Volumes
The"existing" traffic volume peak period count locations and dates of collection can be seen in Table 1.
�lr Figure 3 and Figure 4 in the appendix summarize the existing AM and PM peak hour volumes for each of
these locations. Based on the existing traffic volumes, projected traffic growth by NCTCOG, existing
traffic patterns, predicted future traffic patterns, and discussions with other agencies involved in the
project,projected traffic volumes for the study area were generated. These projected volumes were then
assigned to each alternative roadway pattern based on the predicted future traffic patterns for each of the
alternatives identified.
Table 1. Existing Volume Data Collection
Location Date
FM 1709 at Kimball Avenue 5-13-99
FM 1709 at Commerce Street N/A
FM 1709 at Southbound SH 114 Frontage Road 3-24-99
Park Boulevard at Northwest Highway 1999
SH 114 at Kimball Avenue 3-9-99
SH 114 Southbound Frontage Road at Gateway Boulevard N/A
SH 114 Northbound Frontage Road at Park Boulevard/Wall Street 3-24-99
SH 114 Northbound Frontage Road at Gateway Boulevard N/A
ALTERNATIVE CONFIGURATIONS
Four alternatives, including the present TxDOT design plan, were developed and evaluated in
determining the best alternative to provide access between SH 114 and FM 1709. These four alternatives
are described below and are shown in figures in the appendix.
• Current TxDOT Design
Under this alternative the existing bridge connecting FM 1709 to the northbound SH 114 frontage
road/Park Boulevard/Wall Street intersection would be removed and no connection between these roads
would be rebuilt. An alternative connection from Northwest Highway in Grapevine to Gateway
Boulevard in Southlake would be provided. This alternative is shown in Figure 5 with corresponding
AM and PM peak hour traffic volumes provided in Figures 6 and 7.
• Alternative 1 - One-Way (Westbound) Bridge
FM 1709 at SH 114 Alternative Configuration Evaluation Page 3
r I 4
This alternative would appear similar to the existing bridge, but the bridge would be replaced with a
bridge allowing westbound traffic only. In addition,Wall Street traffic would be restricted to a right turns
in and right turns out only intersection with Park Boulevard. This alternative is shown in Figure 8 with
corresponding AM and PM peak hour traffic volumes provided in Figures 9 and 10.
• Alternative 2 - Direct Connection
This alternative provides a direct connection between the northbound SH 114 frontage road and FM
1709. Traffic at the northbound SH 114 frontage road/Park Boulevard/Wall Street intersection would
operate similar to the current TxDOT design. This alternative is shown in Figure 11 with corresponding
AM and PM peak hour traffic volumes provided in Figures 12 and 13.
• Alternative 3 - One-Way (Westbound) Bridge with Park Boulevard Bridge
This alternative is similar to Alternative 1 except an additional bridge is provided for Park Boulevard
traffic to access the southbound SH 114 frontage road without using the westbound FM 1709 and
southbound SH 114 frontage road intersection. At the intersection of the Park Boulevard extension and
the southbound SH 114 frontage road, an acceleration lane for the Park Boulevard bridge traffic is
provided to allow a merging maneuver between the two roadways. This alternative is shown in Figure 14
with corresponding AM and PM peak hour ti affic volumes provided in Figures 15 and 16.
EVALUATION OF ALTERNATIVE CONFIGURATIONS
There are several advantages and disadvantages to the four configurations described in the previous
section. Key components considered in evaluating each of these alternatives were the operational
effectiveness and the geometric feasibility. A discussion of specific operational aspects of each of the
alternatives is provided in the next section. The remaining components are summarized by each
alternative in Table 2.
OPERATIONAL ANALYSIS OF ALTERNATIVE CONFIGURATIONS
The operation of these alternative configurations was analyzed using several transportation analysis
software-programs. For each of the alternatives, the signalized intersections in the study area were
evaluated. The signalized intersections were:
• FM 1709 at Commerce;
• FM 1709 at SH 114 southbound frontage road;
• Northwest Highway at Park Boulevard;
• Northwest Highway at SH 114 northbound frontage road;
• Northwest Highway at SH 114 southbound frontage road; and
• SH 114 northbound frontage road at Park Boulevard and Wall Street.
Table 3 shows the results at these locations under each alternative. It should be noted that all
configurations operated satisfactorily for projected 2010 volumes. However,the goal of this analysis was
FM 1709 at SH 114 Alternative Configuration Evaluation Page 4
a 4
to identify added efficiencies present in any of the alternative configurations as well as noting the
differences between the various configurations. This will ensure that the selected alternative will
continue to operate at acceptable LOS well into the future.
The current TxDOT design operates at LOS C or better for all intersections in the study area. The design
does have some trouble spots with less than desirable operation. During the forecast PM peak hour,the
east and westbound approaches at the Northwest Highway and southbound SH 114 frontage road
intersection operate at LOS D. Also,the northbound approach on the SH 114 frontage road at Northwest
Highway operates at LOS D in both the AM and PM peak periods. While analyses were not'conducted at
Kimball Avenue,the current TxDOT design will also direct significant left turn volumes to the Kimball
Avenue interchange with SH 114. Initial estimates indicate that the current design could result in
approximately 500 additional PM peak hour left turns at Kimball Avenue.
Alternative 1 operates with approximately 14 percent more total delay during the AM peak than the
current TxDOT design. During the PM peak,Alternative 1 operates with 8 percent less total delay than
the current TxDOT design.
Alternative 2 is essentially equal to the current TxDOT design during the AM peak period. Total delay
for the current TxDOT design and Alternative 2 differs by less than one percent for the AM peak period.
During the PM peak, Alternative 2 operates with 17 percent less total delay than the current TxDOT
design.
Alternative 3 provides the lowest total delay of the alternative configurations analyzed. During the AM
peak, Alternative 3 operates with 10percent less total delay than the current TxDOT design. This
difference is even larger during the PM peak when Alternative 3 operates with 18%less delay than the
current TxDOT design.
The final row in Table 3 summarizes the projected delay values in vehicle-hours at the signalized
intersections under each alternative for both the AM and PM peak hours. It is important to note that the
total projected delay for the TxDOT current design does not include any values for the FM 1709 at
southbound SH 114 frontage road intersection,since this was analyzed as an unsignalized intersection for
this alternative. The performance of the TxDOT current design was expected as the other alternatives
spread out the traffic to different access points,providing more options for motorists,and reducing traffic
volumes at the Northwest Highway and SH 114 frontage road interchange. It should be noted, that the
TxDOT current design has the highest predicted total delay value for the study area,yet it has the lowest
traffic volume throughput based on the volume assignment for the study area.
NCTCOG VOLUME PROJECTIONS
Lee Engineering obtained volume projections from the NCTCOG that forecast ADT levels for the study
area roadways in the year 2025. Two projections were obtained, one reflecting the current TxDOT
planned design, and the other reflecting volumes with a westbound bridge connection from northbound
SH 114 frontage road to FM 1709. The projection for the current design shows approximately 36,000
vehicles per day using the bridge connecting Northwest Highway and Gateway Boulevard. NCTCOG
FM 1709 at SR 114 Alternative Configuration Evaluation Page 5
volume projections for the bridge drop sharply when a westbound bridge connecting the northbound SH
114 frontage road and FM 1709 is provided. NCTCOG year 2025 projections also show that the
reduction in volume at Kimball Avenue and SH 114 could be as many as 8,000 vehicles per day if a
westbound bridge is constructed. One concern of the City of Southlake is that improved access to FM
1709 will negatively impact the western portion of the FM 1709 corridor near Davis Boulevard. Area
volume projections from NCTCOG indicate that the impacts of the westbound connection to FM 1709
from the northbound SH 114 frontage road will have little impact on the area west of Kimball Avenue.
FM 1709 at SH 114 Alternative Configuration Evaluation Page 6
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RECOMMENDED ALTERNATIVE
Based on our analysis of the alternate configurations,Alternative 3 provides the most benefit to the
area. Alternative 3 includes the westbound bridge connecting FM 1709 with the northbound
frontage road and the Park Boulevard extension that connects to the southbound SH 114 frontage
road. This alternative allows continued access to FM 1709 for people traveling north from SH 114.
Alternative 3 provides a more direct route for northbound SH 114 to westbound FM 1709 traffic and
relieves the heavy northbound left turn volume at the Northwest Highway interchange,considerably
improving its operation. In addition,the westbound bridge reduces the amount of traffic making the
left turns onto Kimball Avenue from SH 114. This solution also provides greater access alternatives
and improved operation for the motorists using Park Boulevard as they could avoid making right turn
then left turn movements at Northwest Highway and FM 1709,to access the SH 114 frontage roads.
The heavy southbound right turn volume on Park Boulevard at Northwest Highway as well as the
heavy westbound left turn volume from Northwest highway to the southbound frontage road would
be significantly reduced by implementation of this alternative.
Previous plans included the realignment of FM 1709 to join Northwest Highway using the bridge
currently being constructed. However, since these plans were proposed, considerable commercial
development has occurred in the area. Alternative 3 would eliminate the need for the FM 1709
realignment.
Alternative 3 provides the best combination of access and level of service for this area of the City of
Southlake. Operations and property access in the area will be significantly impacted by the
demolition of the FM 1709 bridge. New construction of a westbound only bridge, as well as
extending Park Boulevard across SH 114 should provide good levels of service at all the
intersections in the area, as well as greatly improve the access for the citizens of Southlake and
Grapevine when compared to the current TxDOT design.
FM 1709 at SH 114 Alternative Configuration Evaluation Page 9
' I 4
L
APPENDIX
FM 1709 at SH 114 Alternative Configuration Evaluation Page 10
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