Item 6A - Traffic Consultant Southlake - Lee EngineeringTrip Generation Averages vs Variability
• Average numbers are used from a nationwide data set
• Actual counts have variability
• Based on Sizes of development
• Based on specific Land Use Selected
• Based on specific tenant type
• Based on success/ market economics
110 General Light Industrial
130 Industrial Park
140 Manufacturing
150 Warehousing
151 Mini Warehousing
154 High Cube Warehousing Transload / Short
155 High Cube Fulfillment Center SORT
155 High Cube Fulfillment Center NON - SORT
156 High Cube Parcel Hub
157 High Cube Cold Storage
160 Data Center
170 Utility
180 Specialtv Trade
General Light Industrial
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Industrial Park
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Study Site Fitted Curve - - - Average Rate
High Cube Fulfillment Center (Non -Sort)
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High Cube Parcel Hub Warehouse
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Business Park
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2,000
Trip Generation Comparison
to an existing Industrial Site on Kimba
Existing Kimball Industrial Site
• Existing site is not fully leased
• AM / PM Peak Count Only
• Buildings total approximately 338,000 SF — Similar in total size to Mustang site
Kimball Site (May 26, 2021)
Peak Hour Exiting Trips
AM Peak Hour 117 19 136
PM Peak Hour 29 93 122
• 0 - - 11611 .ffTotal
Peak Hour ntering Trips Exiting Trips
AM Peak Hour
51
15
66
PM Peak Hour
19
50
69
Turning Radius Concerns
• Southbound SH 26 to westbound Mustang Ct is approximately 80'
radius.
• Right -turn is into a single westbound travel lane.
• Over -tracking into opposing lanes is necessary.
• Verified in field with observations
• Verified with Autoturn simulation software
• Right -turn vehicles can queue in SB SH 26 right -turn lane and wait if opposing
vehicle obstructs turn
• This conflict will increase as truck and traffic load increases
Example Turn Radii
Movement swings into oncoming lanes on Mustang Movement swings into SB SH 26 Thru lane
and oncoming lanes on Mustang
Turning Radius Improvements
1. Restripe eastbound approach — 11" travel lanes for right and left lane — would allow for
an 18 wide entry lane.
a. Coordinate with TxDOT and Rail to determine if lane striping is necessary between tracks and
SH 26. Creating an unstriped neutral area between tracks and 26 would facilitate larger and
faster over -tracking
2. Restripe eastbound approach to a single outbound lane
a. Would accommodate all trucks inbound
b. Would require additional signal cycle time beyond any previous estimates in TIA
3. Complete reconstruction of approach
a. Widen entry lanes/radius to better accommodate inbound right -turns
a. Would require all new crossing equipment etc.
b. Major construction project requiring coordination with Railroad, TxDOT, and City of Grapevine
b. Would need to consider if any improvement alternatives are available on east side as well with
the goal to eliminate E/W Mustang split phasing and to allow Eastbound Mustang dual left to
be served during track dwell phase.
C. TxDOT may be unwilling to consider a major project due to relative age of SH 26 improvements.
Recommendations
Based on further information gathering and field observations in response
to public comments
1. Work with TxDOT and City of Grapevine to adjust existing eastbound Mustang
Ct signal split time to allow for better accommodation of existing traffic.
2. Based on trip generation of similar site on Kimball, warehousing use for trip
generation may be low if uses are not restricted to warehouse. If uses can not
be restricted, TIA may need adjusted to reflect maximum uses allowable
under zoning.
3. Make site plan conditional on obtaining approvals from TxDOT, Trinity Metro
and City of Grapevine for restriping the eastbound approach to better
facilitate inbound truck movements.
4. Develop new coordinated signal timing plans approved by TxDOT and City of
Grapevine that accommodate the development traffic. The signal timing will
likely require multiple rounds of fine tuning/timing and detection adjustment
as site builds out.