Item No. 9a_supp 
Meeting Date: April 10, 2018 
Airport Drives Traffic
Enhancement Briefing

Background 
Roadway system designed 1968  50 years ago 
5 million annual passengers 
Major realignment for Light Rail 2008 
Right of way/Relocation of northbound lanes 
Prior condition - gridlock within inboard roadway loops typical
Removed return to terminal loop ramps 
Removed 40% of recirculating vehicles 
1968-2018 
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Landside Access Critical to SEA 


Managing a Complex Balance Requires Comprehensive Long-Term Strategic Policy 
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Intelligent Traffic System (ITS) 

Sensors attached to gantries on Airport Expressway and Air Cargo Road capture vehicle count and speed 
Data can determine a general level of service on roadways 

Powerful Data Available for Improvement Initiatives
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Traffic Mitigation Plan 
Instituted for 2012 holiday season 
Implemented as needed during peak periods 9PM-1AM 
Revised and enhanced Thanksgiving 2017 
Automated alerts to Airport Duty Managers 
Coordinate resources and communication to stakeholders 
POS Police 
GT Operators 
City of SeaTac
Operational Mitigations Have Limited Effectiveness 
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Traffic Mitigation Plan (Cell Phone Lot) 


All cell phone patrons utilize Right turn only onto 170th Street to International Boulevard 
Right turn on International Boulevard to South Airport Entrance at 182nd Street 
Right turn to 182nd Street and onto Airport Expressway system to terminal
Traffic Mitigation Plan Level 1 
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Traffic Mitigation Plan (Commercial Traffic) 


Coordinated closure of on-ramp from Air Cargo Road to Southbound Expressway 
Traffic rerouted on 170th Street to International Boulevard to 182nd Street entrance 
Allows greater distance for taxis and TNCs to merge into left lanes to enter third floor GT Plaza
Traffic Mitigation Plan Level 2 
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TNC Re-Match Pilot 
In November 2017, Port authorized signatory TNCs to allow
for vehicles dropping off passengers on the Airport drives
the ability to dispatch for a pickup, bypassing the staging
lot on South 160th Street (Re-Match) 
Re-Match vehicles use the Return to Terminal loop on the
Airport Expressway to enter the Ground Transportation
Plaza on the third floor of the Parking Garage for passenger
pickup 
Re-Match is a product used by TNCs at many major airports 
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Current Routes of TNC Traffic 

Pickups originating from the staging lot (blue) utilize S 160th Street and Air Cargo Road to enter the Ground
Transportation Plaza 
Pickups from Re-Match (purple) drop passengers off at the Airport drives and use the Return to Terminal loop
on Airport Expressway to return to pick up customers 
TNC vehicles can receive trip requests from either the staging lot or immediately after dropping off a passenger 
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TNC Re-Match Pilot Results 
Issue                          Effect                         Notes 
Passenger Waiting Times             Decreased                          Waiting times from Re-Matched
trips are roughly a third shorter
than from the staging lot 
Environmental Performance          E-KPI performance improved by      Average fuel economy of pickup
~4-5% for the participating TNCs      events slightly decreased, but
reduced deadheading more than
made up for it 
Opportunity for TNC Operators       Significantly Increased               Over 4,000 new drivers have made
an outbound trip since Re-Match
pilot implementation 
Deadhead Trips                     Reduced 30,000 deadheading trips   Reduced deadheading decreases 
during December 2017              GHGs, reduces congestion, and
increases driver productivity 
Re-Match has been beneficial both operationally and environmentally 
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Proposed Re-Match Route of TNC Traffic 


TNC trips originating from S 160th Street staging lot (blue) continue to use Air Cargo Road to enter GT Plaza 
Re-Match rides (purple) immediately enter Garage from south entrance and use Helix 1 to third floor 

TNC pickups via Re-Match should see drastic decreases in passenger waiting times 
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Next Steps 
Implement TNC Re-Match in April. 
7 day CPI/Lean LIFT event with > 20 stakeholders April  May 2018. 
Introduce LIFT improvements June 2018. 
Air Cargo Road improvements project. 
Addresses congestion around Cell Phone Lot. 
Design 2018 
Construction 2020 
Arrivals Drives Widening project 
Preferred option May 2018. 
Addresses congestion entering parking, 3rd floor GT plaza/arrivals drives. 
Commission authorization in late August. 
Construction in 2020-2021. 
Continued Focus Going Forward 
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