Whats New at SWA!

We have relocated our Northern Virginia Office to Tysons Corner in Vienna Virginia 4.2017

Our Northern Virginia Office has moved from Falls Church to Tysons Corner, in the Vienna area. The new office is conveniently located between the Tysons Corner and Greensboro Stations on the Metro Silver line.


Please be sure to update our new office location in your contacts to:

Sabra, Wang & Associates, Inc.

8150 Leesburg Pike, Suite 630

Vienna, VA 22182


Boston Street Multimodal Corridor Study 11.2016

SWA introduced the Boston Street study to the community at a public meeting in November to gain their understanding of the operations and needs of the corridor from those that live, work, and travel there daily. The study will provide recommendations to BCDOT that address improving truck access, accommodations for pedestrian and bicycle, travel for residents as well as commuters travel, and safety along the corridor.


Northwest Baltimore Traffic Impact Study 7.2016

SWA presented the findings of a traffic impact study for six schools in the northwest section of Baltimore City, at the Jewish Community Center On July 12th, 2016. The City received feedback from residents on issues relating to sidewalk conditions, heavy traffic intersections and difficult to cross streets that become blocked during school arrival and dismissal times. SWA shared the distribution of how school children travel to each school asked the attendees to markup aerial maps of each school’s campus and neighborhood on additional concerns they have relating to the safety of traveling to school.

City of College Park all day Charrette 5.2016

The planning group conducted an all-day charrette for the City of College Park. TPG discussed the merits of converting over a dozen local streets into bike boulevards in an effort increase biking mode share and leverage the Town’s expansive trail network. TPG presented to residents and to officials across multiple jurisdictions, including the University of MD; College Park planning staff; Prince Georges County DPWT; SHA; and MNCPPC. Presentations overlapped with an interactive website developed by the GIS team that showed all project materials and data, and also allowed for direct map-based public feedback.  The project concludes with a final report and recommendation, cost analysis, and implementation and phasing plan.

Sabra, Wang had the pleasure of showcasing at the 2016 Towson University GIS Conference (TUGIS). 4.2016

Our GIS team was able to show what they have done at the TUGIS conference this year. Matt was accompanied by the other GIS analysts; Jessica, Christine and Marissa.


Morteza also made an appearance helping to promote the GIS services we provide to our clients. Our GIS staff has grown in the past three years and we are very proud of what they have been able to accomplish. To check out some of what they have done go to: swa-gis.maps.arcgis.com/home/

Sabra, Wang has continued it’s success with Signal Optimization by winning another ACEC award. This time for Washington, D.C. 3.2016

In May 2015, the District of Columbia, under the direction of DDOT Project Manager Wasim Raja and SWA Project Manager Robin Fish, completed a 4 year, $2.15 million project to upgrade controller firmware and coordinate and optimize traffic signal timings at 654 intersections in the Downtown Core of the District. This project was undertaken with the primary goals of making DC traffic signals safer and friendlier for pedestrians; improving bus running times and reducing bus delays; improving overall traffic flow; and reducing vehicular traffic emissions. The previous signal optimization project was completed in 2004-2005 without the use of traffic volume data; in the intervening years, travel patterns and traffic volumes changed significantly due to expansive growth and economic development. The final results surpassed all expectations with a 23% reduction in travel delays, 13% fuel savings, and a reduction of nearly 240,000 kilograms of harmful emissions in the first year, making the Downtown core safer and friendlier for all motorists, transit passengers, cyclists and pedestrians that use the District’s roadways every day.  Benefits analyses showed that the project paid for itself within 6 days and resulted in an annual benefit of $12 Million in fuel savings alone.  The benefit-to-cost ratio was 40:1, meaning for every $1 invested, the project resulted in $40 of benefits.


The project was performed in two primary phases. The work in Phase 1 was a critical first step in developing a solid foundation to enable the more extensive signal timing changes in Phase 2 and consisted primarily of upgrading the vintage 1980s controller software to the latest version and updating key safety-sensitive signal timing parameters to meet the standards of the 2009 Federal MUTCD.


Signal timing optimization was performed in Phase 2 using a complex computer model that was calibrated to local driver behavior, the District’s roadway network, and local traffic flows.  The project successfully improved pedestrian safety, while also reducing vehicle and bus travel time, delays and emissions.  The project not only resulted in a more efficient transportation system, but did so in an incredibly cost-effective manner – less than $3,500 per intersection.

Congratulations to the SWA team on a job well done!

Online Data Application

Development. 2.2016

The purpose of the App is to enable engineers, planners, and analysts to quickly identify available traffic count data. Traffic count data often includes vehicle, pedestrian, and bicycle counts. The application will show locations where the count data is stored. This will help staff save time looking for available in-house data as well as identify areas where data collection is most needed.

SWA is pleased to announce Morteza Tadayon has joined as an Executive Senior Associate! 1.2016


Sabra Wang & Associates is pleased to announce that Mr. Morteza Tadayon has joined SWA as an Executive Senior Associate. Morteza spent 29 years with the Maryland State Highway Administration (SHA). Before retiring from SHA, Morteza was the Division Chief of the SHA's Office of Planning and Preliminary Engineering (OPPE), Data Services Engineering Division (DSED) and was managing Travel Forecasting and Analysis, Highway Services Information, OPPE's IT and the SHA's GIS program.


Morteza's Roots


Before Joining OPPE in 2006, Morteza spent 19 years with the Office of Traffic and Safety (OOTS) and the Traffic Engineering Design Division (TEDD). During his tenure at SHA, Morteza started many initiatives including the Maryland Road Safety Audits (RSA) program in 2003 and the Maryland Statewide Transportation Model (MSTM). He started The Mobility Dashboard, procurement of major CATS and contracts to lead the GIS and EGIS program to a new level, the Data Governance initiative, and the Annual Mobility Report.

Morteza at Sabra, Wang


Morteza's role at SWA will be to assist in the day-to-day operations, business relations, business development, and helping SWA grow in IT, GIS, Asset Management, and Transportation and Environmental planning. We are very excited to have Morteza on board and look forward to abundant growth and success.


Welcome aboard Morteza!

BCDOT Traffic Study. 11.2015

Sabra, Wang & Associates Inc. is  conducting a study of the St. Paul Street and Calvert Street corridor from University Parkway to Fayette Street to investigate the impact of converting the one-way couplets to two-way traffic flow for the Baltimore City DOT.  Impacts to travel time, on-street parking, transit headways, walkability, and bicycle infrastructure are being evaluated to determine if two-way flow will create a more balanced north-south transportation network as well as a more livable community without significant disruptions to the existing flow.

Upcoming Public Meetings

December 1, 2015 -  7:00 PM to 9:00 PM

Saint Philip and James Church

2801 N. Charles Street,

Baltimore MD 21218


December 9, 2015 - 7:00 PM to 8:30 PM

Baltimore Montessori School

1600 Guilford Avenue

Baltimore MD 21202


December 15, 2015 - 6:00 PM to 8:00 PM

Benton Building

417 E. Fayette Street

Baltimore MD 21202, 3rd Floor Conference Room

Mayor Announces Charles Street is Complete. 10.2015

Sabra, Wang & Associates, Inc. (SWA), as a subconsultant, led the traffic engineering design, including traffic engineering analysis, and preparation of utility design and roadway design for the $25 Million rehabilitation of 1+ miles of Charles Street adjacent to Johns Hopkins University.


The project included developing MOT plans with consideration to maintaining a safe passage through the work zone to accommodate a major pedestrian crossing of 14,000 students per day across Charles Street, maintenance of residential permit parking during all stages of construction, and conversion of Charles Street from one-way to two-way operations, developing lighting design for the Plaza, traffic signal phasing during construction and sequence of operations with the adjacent service road.

SWA Wins FTA / USDOT cutting edge SBIR
research project...Again!

For the second time SWA is awarded a research and development project under the United States Department of Transportation (USDOT)’s Small Business Innovation Research (SBIR) program. This project awarded by the Federal Transit Authority  will be lead by SWA and two partners, Heusch Boesefeldt America (HBA) and Traffic Technology Solutions (TTS), to develop an “On-Board Eco-Approach and Departure System for Transit Vehicles”. This project will develop a system of hardware and software applications to monitor in real-time location and route of transit vehicles, compare them with real-time signal phasing and timing (SPaT) information from traffic signals in the street network, and predict and communicate eco-approach and departure information to transit vehicles through on-board Mobile Data Terminals (MDT) or Human-Machine Interface (HMI) devices. The first phase of the project, being the proof of concept, will be completed in the next six months.


SWA continues to strive to enhance traffic safety to the motoring and on-motoring public in signalized street networks. In an earlier research and development project, sponsored under the United States Department of Transportation (USDOT)’s Small Business Innovation Research (SBIR) program, SWA led and completed a major ($900,000) project for the Federal Highway Administration, with Kimley-Horn and Associates being a project partner, and developed mathematical algorithms to balance safety and operations in an adaptive signal control system network. The results have been implemented nationwide with significant improvements to safety and operations in heavily congested signalized networks.

DC Cycletrack 10.2015

Sabra, Wang & Associates, Inc. was the lead consultant responsible for alternatives development, stakeholder and public outreach, conceptual design, transportation analysis and preliminary engineering. SWA studied protected bike facilities that will connected the Shaw neighborhood with Downtown, in a geographic area bordered by 4th Street, NW to the east; 9th Street, NW to the west; Florida Ave to the North and Constitution Ave to the South.

Key challenges of designing and connected and protected bike network in the corridor:

  • Discontinuity from northern end to southern end
  • Sharing dedicated space with bus traffic
  • High curbside parking demand
  • High transit route density – both public transit buses (including commuter buses) and tour buses
  • Frequent blocking of lanes by delivery trucks, taxis, buses and passenger vehicles, forcing an unnecessary merge into mixed traffic.


dccycletrack.com | Site managed by SWA

The Pope was in town 9.2015

Sabra, Wang & Associates, Inc. provided expert traffic engineering and public information support services to the District Department of Transportation in preparation for the 3 day visit of Pope Francis. SWA performed a traffic analysis for worst case scenario conditions and developed closure and alternate route maps that were presented to the Mayor as well as distributed to the media and the public. SWA developed mitigation measures including a robust Public Information and Outreach campaign, specially modified signal timings, strategic deployment of Traffic Control Officers and placement and wording of Dynamic Message Signs. During the 3 day visit SWA provided around-the-clock support and performance monitoring, including on-site traffic engineering staff for implementation of “on-the-fly” signal timing changes and regular traffic system reports that were communicated to the public via social media. SWA’s efforts were successful, contributing to some of the lowest weekday congestion levels seen in the District.

Dulles Corridor Metrorail 8.2015

Sabra, Wang & Associates, Inc. (SWA), as a subconsultant, is providing traffic engineering and transportation planning services including traffic data collection, traffic analysis, signal warrants analyses, traffic studies, traffic signal design, Transportation Management Plan, Photometrics, on-site support, and utility design. Phase 2 will extend the Silver Line 11.4 miles west into Loudoun County, Virginia, from the Wiehle-Reston East Station. It includes six stations: Reston Town Center, Herndon, Innovation Center, Dulles International Airport, Route 606 and Route 772. The Silver Line will provide high quality, high-capacity transit service in the Dulles Corridor. The new Metrorail service will help mitigate traffic congestion, expand the reach of the existing regional rail system, offer a viable alternative to automobile travel, and support future transit-oriented development along the corridor.

7055 Samuel Morse Dr., Ste. 100
Columbia, MD 21046
443-741-3500 | F: 443-741-3700

MBE, DBE, LDBE  & SWaM Certified


Presentations & Reports

2017 Sabra, Wang & Associates, Inc. | All rights reserved | Contact us

Online Data Application Development. 2.2016

The purpose of the App is to enable engineers, planners, and analysts to quickly identify available traffic count data. Traffic count data often includes vehicle, pedestrian, and bicycle counts. The application will show locations where the count data is stored. This will help staff save time looking for available in-house data as well as identify areas where data collection is most needed.