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Seattle Freight Advisory Board
Tony Mazzella, Jon Pascal (Transpo Group)
May 20, 2014
Seattle Industrial Areas
Freight Access Project Summary of Existing Conditions
Image Credit: Port of Seattle
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Presentation overview
• Project area
• Project objectives
• FAB workshops
• Existing conditions
• Next steps
• Questions
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Project area
• MICs – Ballard/Interbay
– Duwamish
• Connecting Corridors between MICs
• Corridors from the MICs to the Regional Highway System
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1. Increase safety for all travel modes
2. Maintain and improve truck mobility and access to accommodate expected general traffic, freight, and cargo growth
3. Ensure connectivity for major freight intermodal facilities
4. Reduce environmental impacts, including greenhouse gas emissions
4
Project objectives
Image Credit: WSDOT
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FAB workshops
Issues, concerns, solutions
Performance Measures
Summary of Existing Conditions Today
Future Conditions June 17
Draft improvement concepts TBD
Final Draft improvement projects TBD
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Existing conditions for trucks
• Street network
• Mobility constraints
• Corridor volumes
• Corridor travel speeds
• Collision history
• Pavement and bridge
conditions
• Multi-modal demands
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Street network
7
• Arterial Streets – trucks are allowed
• Major Truck Street: – principal arterials
– Complete Streets ordinance states “freight will be the major priority”
• Last mile connections
Arterial Map
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Geometric Constraints
At-grade RR Crossings
Intersection Operations
Height Restrictions
Mobility constraints
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Mobility constraints
9
Weight & Width Restrictions Port/Rail Yard Operations
Moveable Bridges
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Mobility
constraints
10 Map of Constraints
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Auto
Peak Auto
Peak
Truck Peak
Average daily truck & auto volumes
11 Source: 24-hour tube counts from 14 locations in the Duwamish MIC.
0
5,000
10,000
15,000
20,000
25,000
Daily
Tra
ffic
Vo
lum
e
Time of Day
Non-Truck Volume
Truck Volume
Peak
Overlap
Peak
Overlap
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Draft truck
volumes
12
• 15th Avenue NW and
Elliott Ave W have the
highest daily
percentage of trucks
• Limited east-west truck
routes
• Data gaps still exist
North
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Draft truck
volumes
13
Central
• Few surface street
connections through
Downtown
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Draft truck
volumes
14
• Trucks account for more than 10 percent of traffic on most roadways
• Port activity contributes to the large number of Duwamish truck movements
South
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25
30
35
40
45
1:0
0 A
M
2:0
0 A
M
3:0
0 A
M
4:0
0 A
M
5:0
0 A
M
6:0
0 A
M
7:0
0 A
M
8:0
0 A
M
9:0
0 A
M
10:0
0 A
M
11:0
0 A
M
12:0
0 P
M
1:0
0 P
M
2:0
0 P
M
3:0
0 P
M
4:0
0 P
M
5:0
0 P
M
6:0
0 P
M
7:0
0 P
M
8:0
0 P
M
9:0
0 P
M
10:0
0 P
M
11:0
0 P
M
12:0
0 A
M
Avera
ge T
ravel S
peed
Time of Day
New travel speed methodology
15
• Congestion measured as percent of posted speed limit – i.e. < 60% of speed limit is
severely congested flow
• Focus on peak periods • 7:00 to 9:00 AM
• 3:00 to 5:00 PM
Example
Average auto &
truck speeds
AM
Peak
PM
Peak
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Draft congestion levels – north
PM Peak: 3:00 – 5:00 PM AM Peak: 7:00 – 9:00 AM
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Draft congestion levels – central
PM Peak: 3:00 – 5:00 PM AM Peak: 7:00 – 9:00 AM
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Draft congestion levels– south
AM Peak: 7:00 – 9:00 AM PM Peak: 3:00 – 5:00 PM
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System
reliability
19
What it Measures
• Variability of travel time
or delay
• Concept of buffer index
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Buffer index
Buffer Index
(40%)
95th-Percentile
(21 min) minus Average
(15 min)
Average
(15 min)
( ) =
Example Plan for 40% more travel time ~
or six additional minutes to
arrive on-time
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Rail operations
• At-grade rail crossings
on mainline in MICs
Average Daily Totals (2012 weekday)
Duwamish MIC MIC
connection
Holgate
Street
Lander
Street
Broad
Street
Train Crossings 107 87 52
Total Gate Down Time (hours) 3.6 3.7 2.8
Average Gate Down Time (min.) 2.0 2.5 3.3
Minimum/ Maximum Gate Down
Time (min.) 0.3 – 8.2 0.5 – 8.1 1.1 – 11.6
Average Train Speed (mph) 7.4 8.1 6.7
Minimum/Maximum Train Speed
(mph) 0.4 – 24.6 0.5 – 22.9 0.3 – 22.7
Source: SDOT Coal Train Traffic Impact Study (2012)
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Next steps
May 2035 Conditions and Needs
Identification
June Improvement Project Identification
and Prioritization
July Preparation of Draft Plan
September Release of Draft Plan
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Questions?
[email protected] | (206) 684-0811 www.seattle.gov/transportation/freight_industrialareas.htm
http://www.seattle.gov/transportation