Faculty Directory

Chang, Gang-Len

Chang, Gang-Len

Professor and A. James Clark Chair
Director, Traffic Operatoins and Safety Laboratory
Manager. ATTAP Program
Civil and Environmental Engineering
3140 Jeong H. Kim Engineering Building


  • Ph.D., University of Texas at Austin, 1985
  • M.S., National Chiao Tung University, 1979
  • B.Eng., National Cheng Kung, 1975


  • Network traffic control
  • Freeway traffic management and operations
  • Real-time traffic simulation
  • Dynamic urban systems


UMD Civil and Environmental Engineering in Top 20

Department soars to #19 among publics in the latest USWNR graduate rankings.

TRB Roundup: EVs and Equity

Researchers explore community cost-sharing, road use charges.

Chang, Students Honored with Mickle Award

A UMD research team wins one of the transportation field’s most prestigious honors.

New Research Showcased at TRB

Transportation safety, impact of telecommuting among topics covered by UMD experts.

Data-Driven Research, Pandemic Impact Highlighted at TRB

UMD researchers presented new findings, tools, and technologies, including a COVID-19 Impact Dashboard that leverages mobile device data.

UMD Presents New Research at TRB Annual Meeting

Papers and poster sessions addressed topics ranging from crash data analysis to tracking the outcomes of major highway projects.

Smart signals, safer intersections

Gang-Len Chang and his research team are testing a way to reduce sudden braking.

CEE Shows Strong Presence at TRB 98th Annual Meeting

Department faculty, staff, and students were highly active at the Transportation Research Board (TRB) Annual Meeting.

CEE Doctoral Candidate Receives UMD Dissertation Fellowship

Yao Cheng's research will reduce traffic congestion and public bus delays.

Four CEE Students Named Future Faculty Fellows

The program offers unique professional development experiences designed to make participants more competitive on the faculty job market

CEE Experts Active at TRB 97th Annual Meeting

Faculty, staff, and students gave more than 50 presentations during the four-day event.

UMD Experts Tackle Critical Topics at Transportation Research Board Annual Meeting

Faculty, staff, and student involvment exemplified the theme "Transportation Innovation: Leading the Way in an Era of Rapid Change."

CEE Transportation Researchers Tackle Critical Topics at 95th TRB Annual Meeting

Areas include visualization, resilience, high-speed rail, and green vehicles.

Traffic Safety and Operations Lab Awarded $1.25 Million by Maryland State Highway Administration

Lab offered Phase-III contract to continue ATTAP program and technical support to the Office of Traffic and Safety.

Chang Featured in Hong Kong University's Distinguished Lecture Series

Professor Gang-Len Chang to discuss topics in urban congestion.

UMD Hosts Advanced Transportation Technologies Day

First-ever event draws dozens from government, industry, academe and media.

Four Civil and Environmental Engineering Students Named 2014 Future Faculty

Nasri, Lu, Maness and Guzman selected as "Tomorrow’s Great Engineering Teachers"

Chang to Deliver Keynote Speech

Professor Gang-Len Chang will deliver keynote speech at the 10th International Conference of Eastern Asia Society for Transportation Studies.

Dr. Chang's Traffic Safety and Operations Lab Awarded a $542,778 Project

The goal is to design and operate an Advanced Incident Response System for Eastern Shore region

Dr. Gang-Len Chang Sought Internationally As Distinguished Speaker

Various educational institutions invite Dr. G. L. Chang as distinguished speaker.

Dr. Gang-Len Chang Awarded $1million by MSHA

Dr. Gang-Len Chang’s ATTAP program extended and awarded by MSHA.

Dr. G.L. Chang's Team to Demonstrate New Variable Speed Control System in Maryland

The research team will collect both field data and driver responses during the one-month demonstration period for effectiveness evaluation.

CEE's Traffic Safety and Operations Lab on Maryland Daily Record

For emergency authorities, real-time data could give an accurate picture during hurricane evacuations from Ocean City and the Lower Shore.

CEE's Dr. Gang-Len Chang Quoted in American Institute of Physic's Interview

Dr. Chang and the Traffic Safety and Operations lab featured in the interview about traffic congestion

Dr. Gang-Len Chang receives $500,000 grant from DHS for the I-495 project

The goal is to explore the potential for deploying a real-time traffic management and travel time prediction system.

Dr. G.L. Chang's Comments Appeared On "The Capital" Newspaper

Dr. Chang's comments appeared on The Capital newspaper in Annapolis, MD