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About Us

TJKM offers a wide range of services with specialized expertise in transportation planning, traffic operations, freeway and corridor studies, traffic engineering design (including PS&E), intelligent transportation systems (ITS), traffic safety, and multimodal studies. TJKM currently has its headquarters in Pleasanton and offices in California; Tampa, Florida; and Austin, Texas.

TJKM has been involved in more than 8,000 transportation projects throughout California and Nevada. For more than 45 years, more than 3,500 satisfied clients have entrusted TJKM with their consulting needs. TJKM serves a full range of clients, including municipalities, congestion management agencies, metropolitan planning organizations, Caltrans, transportation agencies, private developers, other consulting firms, and attorneys. Serving both public and private clients, TJKM’s knowledge of municipal frameworks, coupled with their reputation for completing projects on time and within budget, has given us a prominent and respected standing within the industry.

We know the unique requirements, area, and stakeholders, providing insight and expertise that informs a variety of solutions–backed by the resources and perspective of a leading firm. We perform at the local level with the knowledge it takes to clearly communicate to all involved and are experts at presenting complex concepts in terms that every stakeholder can understand.

TJKM is a Certified Disadvantaged Business Enterprise (DBE) and a Small Business Enterprise (SBE) within the State of California. TJKM is DBE certified and pre-qualified by FDOT and TxDOT.

History

TJKM was founded in 1974 by Richard Tammen, Arnold Johnson, Chris Kinzel, and Robert Mimiaga . The original office was located in Walnut Creek for the first 10 years. In the early 1980s, TJKM moved to Pleasanton and played a substantial role in the planning and development of the Hacienda Business Park, where the company currently maintains its headquarters.

On September 1, 2012, TJKM was acquired by Nayan Amin and Ruta Jariwala. Since then we have expanded our expertise in the field of traffic operations, travel demand modeling, complete streets, and traffic adaptive signal systems to enhance the transportation infrastructure for all modes of transportation. Since 2013, TJKM annual growth has exceeded 35%, with 85% of our business coming from repeat clients. Our repeat business and our dedication to building relationships support our growth and success, and is a testament to our proven ability to exceed our client’s expectations.

Management

Nayan Amin, TE

President

Mr. Amin has more than 31 years of both public and private sector experience in transportation planning, traffic impact studies, transportation management plans, construction scheduling, construction area signs, signing and striping, traffic signal coordination, traffic operations, transit priority, traffic signal systems, freeway and arterial management studies, intelligent transportation systems planning, and design and construction oversight. He has developed optimized signal timing plans and implemented them for more than 2,000 traffic signals throughout the United States.

Nayan served as Project Manager for MTC PASS Project for 2010-2012 cycles, responsible for development of optimized signal timing plans and implementation for more than 1,000 traffic signals throughout the San Francisco Bay Area. Additionally, he has extensive experience on projects related to transit priority, incident management flush plans, traffic responsive, and traffic adaptive systems. He also specializes in macro and microscopic model development and application for analysis of traffic impacts. His experience also includes multimodal operations, light rail, bus rapid transit, pedestrians, bicyclists, and traffic safety and operations.

Ruta Jariwala, PE, TE

Principal

Ms. Jariwala has more than 22 years of professional experience in traffic operations, transportation planning, freeway and arterial management studies, signal coordination, traffic signal systems, traffic impact studies / environmental impact reports (EIRs) and intelligent transportation systems planning, design, and construction oversight. She also has experience on projects related to transit priority, incident management flush plans, traffic responsive, and traffic adaptive systems.

She has extensive experience in macro and microscopic model development and application for analysis of traffic operations for express lane studies. Her experience also includes multimodal operations, light rail, bus rapid transit, pedestrians, and bicycle and traffic safety studies. She has worked on numerous signal coordination projects throughout California, where she was responsible for development and implementation of optimized signal timing plans.

Directors & Key Staff

Vamsee Modugula

Director, Travel Demand Forecasting

Ms. Modugula has 24 years of experience in leading transportation planning firms in the United States and India in the field of travel forecasting models. She is an expert in passenger and freight travel demand forecasting models, mobility plans, master plans, demand assessment, and public transport feasibility projects. She also has extensive experience in transportation planning software such as CUBE, TransCAD, and EMME. Ms. Modugula has conducted numerous training sessions in model development and Cube software.

Kamlesh Saxena

Director of Corporate Affairs

Mr. Saxena brings an unparalleled record serving national and international clients in their infrastructure design and transportation technology needs. Mr. Saxena has directed multi-disciplinary design and deployment teams for complex regional projects including software, communications, and system engineering elements. He has led arterial, freeway, multimodal, security systems, and intelligent transportation systems (ITS) projects from concept to operations. His experience includes program management involving all phases of ITS, freeway, and arterial traffic systems, including planning, design, specifications, implementation, construction, and connected/autonomous vehicle (CAV) project design. He is a specialist in the design and integration of communications and software. Mr. Saxena has 41 years of experience managing numerous computerized control system projects throughout the United States and abroad, through feasibility, planning, design, construction, and implementation phases. He has held numerous lead roles in professional organizations and led the team as an invited Industry Fellow that developed the first National ITS Program Plan submitted to US Congress for approval. Mr. Saxena has a master’s degrees in Physics and in Management Science/Information Systems.

Erik Bjorklund

Project Manager

Mr. Bjorklund has 31 years of design experience, including 28 with TJKM. He has been the project manager and lead designer for more than 1000 signal design, modification, and signal interconnect projects throughout California, and has prepared hundreds of miles of signing and striping (S&S) design plans using AutoCAD. Mr. Bjorklund has extensive experience performing field analyses to determine geometric configurations of intersections, and has conducted many peer reviews of other designers’ work, providing clients with useful design modifications. He has also designed the roadways for the civil firms to provide the correct transitions, deceleration lanes and toppers. During his tenure with the City of Brentwood, Mr. Bjorklund plan checked Joint Trench, Interconnect, Fiber Optic, Street Lighting, Traffic Signals, and Signing and Striping Plans.

Many of the design projects Mr. Bjorklund has led and managed include Caltrans coordination and obtaining encroachment permits. His familiarity with Caltrans’ design standards results in minimal plan check revisions, moving design projects efficiently through the Agency’s approval process. TJKM’s design projects often include construction support services and Mr. Bjorklund has established a good working relationship with many of the developers and contractors in the Bay Area.

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