TPD specializes in providing traffic signal design and ITS signals system operations, and is intimately familiar with the broad range of services required to successfully complete signal-related projects timely and efficiently. TPD’s Traffic Engineering Department has the manpower and knowledge to provide prompt response and service to satisfy client’s traffic signal needs. Our Team is comprised of professionals from across the board, including former DOT staff, engineers, and designers with proven experience in every aspect of traffic signal design, operations, structural analysis, coordination, permit plan compliance review and inspection.

TPD provides traffic signal system design services for projects ranging from a single isolated intersection to corridors with over 50 signalized intersections in heavily-traveled central business districts. In terms of modernization, TPD is fully capable of incorporating the latest technologies in adaptive signal control, detection systems, and Ethernet-based fiber optic communications systems to allow for the interconnection of signals for better synchronization and information access. Once traffic signal systems are operational, TPD’s Traffic Signal Design Team works with municipalities, DOTs and other stakeholders to remotely monitor the operation of the system and help troubleshoot issues that may arise.


Traffic engineering and signal design has been our specialty since the firm’s inception in 1989, including the following services:

Traffic signal & system design
– Transportation systems management & operations
– Municipal review / design
– Intelligent transportation systems (ITS)


Improving traffic flow and increasing efficiency with a focus on safety has been a hallmark of our transportation projects. TPD has provided services that run the gamut for a variety of signal-related projects, including:

Closed loop systems
– Traffic demand / adaptive systems
– Intersections / roadways
– Interchanges
– Downtown revitalizations / streetscapes

– At-grade railroad crossings
– Pedestrian / mid-block crossings
– School zones
– Special event signal timing / designs
– Trails


Departments of transportation
– Counties
– Municipalities
– Transit authorities
– Toll commissions / authorities
– Private land developers
– Non-profit agencies
– Educational institutions

Limerick Township, Montgomery County, PA

Service(s): Highway Design. Construction Management and Inspection Services, Traffic Signal & ITS Systems Design & Environmental Services & Permitting
Client(s): Limerick Township

East Marlborough Township, Chester County, PA

Service(s): Multimodal, Complete Streets & Mobility Services, Traffic Signal & ITS Systems, Municipal Engineering Services, Highway Design
Client(s): East Marlborough Township

Tredyffrin Township, Chester County, PA

Service(s): Traffic Signal & ITS Systems Design & Municipal Engineering
Client(s): Chesterbrook JV, LLC