Project Location: Howard County, MD

Description of Project: The Maryland State Highway Administration (SHA), Office of Traffic and Safety (OOTS), Traffic Engineering Design Division (TEDD) has requested KCI Technologies, Inc. (KCI) and T3 Design (T3D) to prepare plans for formal advertisement to upgrade the existing roadway lighting at the interchange of US 29 at MD 32 and Rivers Edge Road in Howard County. Due to the complexity of the project, multiple redline revisions were required to complete the plan set.

T3D’s Role in Project: T3 prepared interchange lighting base plans at a scale of 1” = 50’ and performed a field inventory to verify existing lighting features such as light pole and sign structure locations and numbers, manhole locations, lighting cabinet locations, and junction box locations on parapets/concrete barriers.

T3 conducted a photometric analyses for the corridor in AGi32 to comply with SHA roadway lighting guidelines. T3 developed photometrics in point-by-point format along with the relevant statistics for each area including the uniformity ratio, veiling ratio, and minimum-maintained lighting level. All luminaires were designed to remove high pressure sodium fixtures and install new 280 Watt LED cobrahead luminaires.

Once SHA approved the photometrics, T3 prepared lighting plans for Final Review and PS&E milestone submittals. These plans included the location of all proposed lighting poles and underpass luminaires, manholes, and new control panels and existing light poles to remain or to be removed. The appropriate “tag” was shown for each pole indicating the location, size, circuit, and number of each type of connector kit. Electrical manholes also were shown with the connector kit tag, and T3 prepared a Schedules of Poles, Panels and Manholes.

T3 also prepared voltage drop calculations, coordinated the new electrical services with SHA’s Traffic Engineering Design Division (TEDD), placed a service application request with Baltimore Gas & Electric, calculating limit of disturbance areas and cut and fill quantities which were shown on erosion and sediment control sheets.

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