ITS Lab Members

Ph.D Student in Civil Engineering

Areas of Interest Freeway Management and Operation

Transit Operation

Intelligent Transportation System

Climate Change

1Huan Li

Huan Li

ITS Lab Members

• Assess optimal stop spacing considering access cost and riding & stopping cost

2Huan Li

Transit Service Evaluation

On-BoardComputer

Radio

DoorsLift

APC (Automatic Passenger Counter)

Overhead SignsOdometer

Signal Priority EmittersStop Annunciation Memory Card

RadioSystem

Garage PC’s

Radio AntennaGPS Antenna

Navstar GPS Satellites

Control Head

• Use high resolution archived stop-level data– One year’s worth of data– Referring all routes in

Portland Metropolitan region every trip every bus stop event

ITS Lab Members

3Huan Li

Transit Service EvaluationR

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14 01NOV2001 8:53:32 8:49:15 8:53:28 285 0 1120 4964 0 0 0 0 0 21 41 10558.58 7644468 67600514 01NOV2001 8:55:00 8:51:41 8:54:46 285 0 1120 4701 4 0 0 0 1 20 50 15215.05 7649112 67632814 01NOV2001 8:56:22 8:52:00 8:55:08 285 0 1120 4537 36 3 0 6 0 26 34 15792.35 7649674 676220

ITS Lab Members

• Analyze lane changing effect on speed using lane by lane oblique curve

• “history data”• Automatically identify HOV lane

merging and diverging features– Indicator: piece wised linear regression for

curve fitting– Endogenous Model vs. Extraneous Model

Traffic Flow Features on HOV lane

4Huan Li

ITS Lab Members

• Next step: compose oblique method with threshold based identification method

• Other applications: incident detection, bottleneck identification….

5Huan Li

Traffic Flow Features on HOV lane