Transit analysis using Modeller’s Extended Transit Assignment

Carmen KwanModel City 201410/16/2014

Source: Sound Transit, 2014http://www.soundtransit.org/documents/pdf/maps/StylizedSystemMap_0611.pdf

Sound Transit – South King County HCT Corridor Study• Analyze potential 2035 ridership of new HCT lines (light rail or BRT)

Downtown Seattle

West Seattle

Burien

SeaTac

Tukwila

Renton

Problem –• Unexpected high east-west

ridership

• Verify if it is transfers north-south transit lines, or land use of nearby zones

Solution - Station-to-Station Analysis

Steps

1. Copy scenario/run extended transit assignment to save optimal strategies

2. Create transit segment attribute & flag transit line

3. Create text file of station node labels

4. Run extended transit traversal analysis

5. Output - text file with O-D stations & riders

6. Use Excel - filter tool to aggregate & chart results

Results

0

200

400

600

800

1,000

1,200

76 53 397

710 0 0 0

137

430

132

561

139

1,132

221

0 0 0 0

150221

Boardings & Alightings at Tukwila International Blvd Sta-tion

3 HR PM Peak

Station

PM

Pe

ak

Pe

rio

d T

rip

s

Conclusion

• Confirmed strong east-west ridership • Facilitates transfers to north-south lines that are not as easy under

current conditions

• Station – to – Station Analysis tool simple to use• Can be used as QA/QC of transit coding• Further analysis utilized the path-based analysis tool for zone-to-

zone transit flows between a specific link