Our traffic engineers provide critical input for both private land development and public infrastructure projects. As developments become larger and more complex, their effect on local traffic conditions becomes more pronounced. Traffic congestion increases, delays, and inconvenience to travelers become more costly and, ultimately, the conditions become unacceptable to the public and more difficult for decision makers to manage. The need for state of the art expertise and experience in understanding, mitigating, and communicating traffic impacts for highways, streets, and complex development projects has never been greater. Costello provides a full spectrum of traffic engineering services for our clients.

Our engineers have conducted detailed traffic impact studies for development projects of all types and sizes. These projects require in-depth knowledge, attention to detail, and a commitment to truly understanding the nature of the overall project and the community in which it will exist. We convert this project-specific knowledge to an estimate of critical traffic generation, the foundation of our traffic impact studies. We apply this same detailed project knowledge and understanding to all of our traffic engineering services.

Clients for whom Costello has provided these services include TxDOT; HCTRA; Brazoria, Galveston, Harris, Fort Bend, and Montgomery Counties; METRO, and the Cities of Houston, Beaumont, Sugar Land, Richmond, and Katy.

Traffic Engineering Services include:


  • Traffic Counts
  • Traffic Surveys
  • Traffic Impact Studies/Analysis
  • Traffic Signal Needs Determination (Warrants)
  • Traffic Signal Design
  • Traffic Signal Timing, Coordination, and Optimization
  • Capacity Analysis (Level of Service – LOS)
  • Geometric Design
  • Access Management
  • Traffic Calming Measures
  • Traffic Control Plans
  • Signing and Pavement Markings
  • Illumination


Traffic Engineering Experience


Katy Main Street Roundabout

experience costello engineering and surveying in Texas

Costello prepared the construction plans for the WoodCreek Pin Oak Development, which is an 86-acre commercial/retail park located in Katy, Texas.  This project included plans for installing concrete pavement, waterlines, sanitary sewer and drainage improvements.  Costello developed the geometrics, signing and pavement markings for installing a 2-lane roundabout interchange at the intersection of Main Street and Nelson Way.  This was developed within a limited right-of-way and accommodates the four approaches of these two 4-lane roads.

Katy Mills Boulevard

experience costello engineering and surveying in Texas

Costello was hired to prepare roadway plans for the extension of Katy Mills Boulevard for Market Place Drive to Katy Mills Circle. As part of these improvements, the City of Katy requested that a traffic signal warrant be performed at the new intersection. Costello conducted the traffic data collection, performed the traffic signal warrant analysis, and prepared a traffic study report for this intersection. A signal was warranted for this location and we were retained to prepare the design plans, specifications, estimates, bid documents, and construction phase services.

Washington Boulevard

experience costello engineering and surveying in Texas

Costello, as part of a project team, prepared the traffic control plans and the traffic signal designs for three intersections as part of the reconstruction of Washington Boulevard in Beaumont, Texas. The scope of the project involved reconstructing 1.5 miles of existing 4-lane asphalt roadway to a 5-lane concrete facility between the IH 10 northbound frontage road and Houston Avenue.  The signal designs replaced the three existing span wire traffic signals with new cantilever mast arm signal installations.