Est. vehicles removed / day
0
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What this means
At 0% shift, today's traffic is unchanged.
I-90 & SR-520 · peak flow
Each mark is a vehicle on the corridor. Buses carry shifted commuters.
Avg weekday speed by hour · WSDOT loop detectors 2015
Cross-section reallocation · MLK Jr Way S
Illustrative: freed roadway becomes bike lanes, sidewalks, and green space.
Illustrative estimates, not predictions. Speed modeled as proportional to vehicle reduction; street reallocation is illustrative.
View assumptions →
I-90 baseline rush speed: 47.6 mph (7–9am weekdays, 2015). SR-520: 53.6 mph. Baseline daily vehicles: ~150,000 (I-90 + SR-520). Seattle car commuters: ~250,000 (ACS 2019). Does not account for induced demand, trip-chaining, or seasonal variation. Source: Seattle Freeway Loop Detector Dataset, UW STAR Lab / WSDOT 2015.