Traffic Engineering & ITS Consulting Services
Montgomery County, MD



  • Signal Timing Optimization
  • CBD Speed Limit Change
  • Transit Signal Priority
  • Bike Signal Operations Analysis


Featured Task: Signal Timing Optimization

SAI has prepared optimized timing plans for the County’s signal timing program on an annual basis from Fiscal Year ’15 through ‘19, including over 450 of the County’s 900 signals in grid networks, urban corridors, shopping areas, suburban commuter roadways and high-speed rural roadways in Gaithersburg, Wheaton, West Rockville, Germantown, Bethesda, North Bethesda, and Woodmont. Work included traffic data collection, the development of Synchro and SimTraffic models, field observations to identify critical intersections & roadways segments and  confirm time-space diagrams and coordination issues, change and clearance interval calculations, analysis of intersection operations including LOS, queues and delays, review of time-of-day plans, operational reviews and recommendations to improve efficiency and safety, development and implementation of optimized signal timing, Before and After travel time and delay studies, RITIS (INRIX probe data sets) travel time data analysis, and benefit analysis of the optimized timing plans. SAI staff have read access to the County’s Siemens ATMS, and the MView video for operational reviews and database download.

Columbia, Maryland

7055 Samuel Morse Drive
Suite 100
Columbia, MD 21046
Phone: 443-741-3500
Fax: 443-741-3700

Baltimore, Maryland
300 East Lombard Street
Suite 840
Baltimore, MD 21202

Phone: 443-741-3500
Fax: 443-741-3700

Baltimore, Maryland
1502 Joh Avenue
Suite 100
Baltimore, MD 21227

Phone: 410-536-3653
Fax: 410-536-3654

Washington, D.C.

100 M Street SE
Suite 550
Washington, DC 20003

Phone: 202-570-7080
Fax: 202-697-5007

Vienna, Virginia

8150 Leesburg Pike
Suite 630
Vienna, VA 22182

Phone: 703-942-8990


2019 Sabra & Associates, Inc. | All rights reserved | Employee Login | Contact us