Phase-III contract offered

Baltimore Evacuation System

When emergency events occur in the urban area, people in the impact zone must be evacuated to the safe locations as soon as possible. An off-line system and an online system are developed for different agencies

I-270 Traffic Analysis

With field studies on I-270 during morning and evening peak hours, our members identified most congested bottlenecks and figured out some potential strategies that will contribute improving traffic conditions.

Xianfeng's Dissertation

Xianfeng Yang finished and received his Ph.D. degree. The dissertation title is “Integrating of Arterial Signal and Freeway Off-ramp Controls for Commuting Corridors”.

Dilemma Zone

The dilemma zone refers to the area where drivers experience difficulty with stop/go decision making when presented a yellow indication. An all-red extension system is developed to protect vehicles in such scenarios.

Real-time Control

To mitigate the congestion and queue spillback near off-ramps, we developed a real-time control system which consists of three primary stages, including data collection, data analysis, and signal priority control.


ATTAP, being one of leaders in unconventional intersection designs, developed a series of methods and tools to boost the application and improvement of such strategies.

Variable Speed Limit

Dynamically adjusting the speed limits can help smooth the speed transition between the upstream free-flow and downstream congested traffic states, thereby preventing the sudden speed drop and the formation of an excessive queues.

Traffic and Incident Management

Evacuating the travelers in case of extreme climate conditions is a serious challenge. A Traffic and Incident Monitoring and Management System is developed to encounter this issue.

Woon's Dissertation

Woon Kim finished and received her Ph.D. degree. The thesis title is “Development of a Traffic Incident Management System for Contending with Non-concurrent Highway Congestion”


ATTAP is jointly initiated by the Office of Traffic and Safety at the Maryland State Highway Administration and the Center for Traffic Safety and Operations at the University of Maryland, College Park.

3_Allpication tools              1_safety             2_control&operation

Control & Operation              Safety                Application Tools

Recent Presentations and Activities


A Tour Guide to ATTAP


ATTAP Quarterly Newsletter (Oct.-Dec. 2015)


Integrated Variable Speed Limit Control to Minimize Recurrent Highway Congestions


An Integrated Signal Control System to Mitigate Queue Spillback on Freeway Off-ramps


Introduction to Unconventional Intersection/Interchange Design in Maryland


Eastern-Shore Regional Traffic and Incident Monitoring and Management System


Introduction to Dilemma Zone Protection System


An Integrated Multi-modal Emergency Evacuation System for the Baltimore Metropolitan area - New


Introduction to MIDCAP and MUID