About Us

On a Mission to Deliver More

In 2008, Dow Peters, PE, and Russell Yaffee, PE, PTOE, founded Peters and Yaffee, Inc., under the principle that one size doesn't fit all. We take an alternative approach to project delivery and business management—one that aligns our clients' objectives with the professional strengths of our staff members. Our goal is to create a work environment that retains a diverse team of engineers through the delivery of impactful community improvements. And with a low employee turnover rate, over 400 successful projects, and 98% repeat clients, we're doing something right!

Since the company's inception, PY has grown to over 25 employees who are cross-trained in multiple traffic and transportation services. We specialize in transportation design, traffic design and operations, and traffic and safety studies. Our projects serve every level of the US government, as well as developers, architects, and other engineering firms from our Florida and Colorado offices. As a minority-owned business we are committed to diversifying the marketplace, starting with our own staff—over 70% of whom are minority and/or female.

Russell Yaffee, PE, PTOE

vice President

Russell is a Principal Traffic Engineer with experience in both the public and private sectors. This includes the preparation of traffic impact studies, level of service analysis, signal design, signing and pavement marking design, and parking lot layout and design. Russell has a passion for safety and in recent years has shifted his focus to vulnerable road users through the design and implementation of Rectangular Rapid Flashing Beacons (RRFB’s), Pedestrian Hybrid Beacons (PHB’s) and Mid-Block Traffic Signals. Additionally, Russell is a member of the National Committee on Uniform Traffic Control Devices (NCUTCD), serving on the guide sign and motorist information technical sub-committee.

Years of Experience | Since 1991
Education | B.S., Civil Engineering, Tulane University

Dow Peters, PE


Dow is a Principal Roadway Engineer with a wide range of experience managing transportation projects for FDOT and other local agencies. This includes PD&E studies, horizontal and vertical geometrics, conceptual interchange design, utility coordination, roadway lighting design, and project cost estimating. He is FDOT certified in specification package development, Long Range Estimating (LRE), and advanced Maintenance of Traffic (MOT). In addition, Dow has experience reviewing and analyzing crash data to determine the safety benefits of proposed roadway lighting systems.

Years of Experience | Since 1998
Education | B.S., Civil Engineering, University of Florida


Small Business Qualifications
MBE & SBE, Florida Department of Transportation
JSEB, City of Jacksonville
ESB, Colorado Department of Transportation
DBE, State of Colorado
MBE & SBE, City and County of Denver
8(a), Small Business Administration
FDOT Pre-Qualifications
3.1 Minor Highway Design
3.2 Major Highway Design
3.3 Controlled Access Highway Design
6.1 Traffic Engineering Studies
6.2 Traffic Signal Timing
6.3.1 Intelligent Transportation Systems Analysis & Design
7.1 Signing, Pavement Marking & Channelization
7.2 Lighting
7.3 Signalization
CDOT Pre-Qualifications
CE, Civil Engineering
TP, Transportation Engineering

Our Services

Transportation Engineering

Roadway Design, Drainage Design & Modeling, Permitting, Intersection Improvements, Corridor Lighting Design, Temporary Traffic Control, Shared-Use Path Design, Construction Cost Estimating, and Constructability Review.

Traffic Operations & Design

Traffic Signal Design, Traffic Signal Retiming, Signing & Pavement Marking Design, Rectangular Rapid Flashing Beacon (RRFB) Design, Pedestrian Hybrid Beacon (PHB) Design, Midblock Pedestrian Signal Design, Fiber Optic Interconnect Design, Intersection & Pedestrian Lighting Design, Traffic Calming Design, Parking Lot Design, and Wrong-Way Driving Warning Systems Design.

Traffic & Safety Studies

Traffic Impact Studies, Traffic Signal Warrants, Safety Studies, Operational Improvement Studies, Lighting Justification Studies, Corridor Studies, Pedestrian Studies, Speed Studies, and No-Passing Zone Studies.