Traffic Engineering & Intelligent Transportation Systems [ITS]

SAI offers technical expertise in traffic engineering and in-depth, local knowledge in traffic engineering specialties including traffic control design, signal system design, signal design, Synchro and SimTraffic signal timing analysis, traffic modeling, lighting design, and intelligent transportation systems (ITS). SAI also offers strong capabilities in other traffic engineering disciplines such as signal warrant studies, speed studies, data collection, and transportation planning.

SAI has 20+ active traffic engineering contracts and has completed 200+ traffic engineering contracts in the past 15 years for counties, state DOTs, FHWA and cities throughout Virginia, Maryland, Delaware, Pennsylvania, and the District of Columbia. Because of this diversity of experience, we have a thorough understanding of the environments in which transportation engineers work and the constraints and challenges they face. SAI brings a blend of the “ground truth” experience in day-to-day operations with proficiency in cutting edge technologies and research to bring innovative ideas and lessons learned from around the region and nation to your project. Our key staff has supervised the design of 2,000+ traffic signals, optimized 5,000+ traffic signals, and performed traffic analysis and studies at 10,000+ intersections over the last 15 years.

Department Services:

Traffic Signal Timing & Operations

  • Traffic Signal Timing Optimization
  • Adaptive Traffic Signal Control System Implementation / Analysis
  • Transit Signal Priority Feasibility, Analysis, Design and Implementation
  • Traffic Signal EVP and Firehouse Preemption
  • Traffic Signal Phasing Analysis
  • Central Traffic Signal System Planning, Design and Deployment
  • Traffic Signal Turn-On
  • Traffic Signal Timing Review
  • Traffic Signal Controller Programming
  • Traffic Signal Timing Training
  • Traffic Signal Timing Research


Intelligent Transportation Systems (ITS) Services

  • Systems Engineering Studies for ITS
  • Concept of Operations for ITS
  • ITS Architecture Studies
  • Transportation System Management & Operations Planning and Analysis
  • ITS Strategic Plans
  • Active Traffic Management (ATM) Planning and Design
  • Dynamic Message Sign (DMS) Design
  • CCTV (Closed Circuit TeleVision) Design for Roadways
  • ITS Detector Design
  • ITS Telecommunications Design
  • Advanced Traffic Management Systems (ATMS) Planning, Design and Deployment
  • Transportation Management Center Planning and Operations
  • Connected & Autonomous Vehicles

Traffic Engineering Design

  • Traffic Signal Design
  • Lighting Design for Roads, Trails, Tunnels and Parking Facilities
  • Lighting Photometric Analysis
  • Signing and Pavement Marking Design
  • Maintenance of Traffic Design and Analysis
  • Highway – Rail Grade Crossing
  • Traffic Control Device Inventory, Assessment and Program Planning
  • Traffic Engineering Policy and Standards Development


Traffic Engineering Operations Services

  • Intersection and Highway Capacity Analysis
  • Traffic Modeling
  • Roundabout Analysis
  • Traffic “Big” Data Analysis
  • Traffic Operations and Safety Studies
  • Congested Intersection and Corridor Studies
  • Mitigation Analyses
  • Corridor Studies
  • Interchange Feasibility Studies
  • Manual on Uniform Traffic Control Devices (MUTCD) Traffic Control Devices Studies
  • Traffic Signal Warrant & Removal Studies
  • Stop Sign Warrant Studies
  • Light Rail Operations & Safety
  • Special Event Transportation Planning
  • Traffic Engineering Analysis

Practice Leader:

Keith Riniker, P.E., PTOE
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Keith is a recognized expert Intelligent Transportation Systems (ITS) / Traffic engineer and experienced project manager. He has over 20-years of experience in traffic engineering analysis; traffic operations; research; planning and design of traffic signals, highway signing, and ITS systems. He has a strong knowledge of the Highway Capacity Manual (HCM), MUTCD, local and state design standards and processes, FHWA, AASHTO, and ITE best practices. His technical experience includes hundreds of traffic operations, safety, and simulation studies; hands-on optimization of signal timings for 3,000+ intersections; design of 500+ signals, thousands of highway signs, and hundreds ITS devices; ITS strategic planning and corridor-wide ITS deployments; and agency-wide traffic signal upgrade projects, including Adaptive Traffic Signal Control; ATMS and Central Signal Systems. Keith is the inventor of the Folded Lefts Interchange; an unconventional interchange, and the inventor of the patent-pending Connected Vehicle technology application EAD.Transit. He is the recipient of the ITSMD Innovative Leadership Award, and the MD SHA OOTS Award for Outstanding Customer Service.

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


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