sign in icon for all TPD employees to intranet page
go back to tpd home page icon
traffic planning and design small phone logo
0 Signal Closed Loop System fma
Home > Services > Traffic Signal & ITS Systems Design > 50 Signal Closed Loop System


City of Scranton
340 N. Washington Street
Scranton, PA 18508

Project Completion Date

April 2011

Construction Cost


Project Overview

Efforts to promote economic redevelopment in Central Business Districts (CBD) are often hindered by the inadequacies of the existing highway network. Likewise, the ability of existing businesses to attract customers to downtown stores, to attract workers to downtown office buildings, or to move goods in a cost efficient manner is impacted by these same inefficiencies.

In the CBD, it is usually impossible to add lanes to increase capacity. Recognizing the fact that they cannot build their way out of the problem, the City of Scranton and PennDOT District 4-0 developed a local match project to implement a closed loop traffic signal system at 50 existing intersections in the Central Business District. The goal of the project is to improve operations at the existing signalized intersections by providing better progression from one intersection to the next than is currently feasible with their existing equipment.

TPD has completed preliminary design on 50 traffic signals including the timing and phasing, roadway geometry, and all the related design in order to identify what improvements are necessary to upgrade these signals into a traffic responsive system. TPD has prepared all analyses (HCS, Synchro, SimTraffic, etc.) in order to develop the best timing plans. TPD has evaluated the different interconnection alternatives (hardwire, spread spectrum, radio, etc.) and we have conducted a spread spectrum radio analyses for use in this project. TPD will be designing over 350 ADA pedestrian ramps in accordance with the current standards. We will be completing the final design plans, specifications, and cost estimates for the Plans, Specifications, and Estimates (P.S.&E.) submission to PennDOT.

Project Responsibilities:

- Public, City Council and Work Session Meetings

- Data Collection Coordination

- Pavement Marking & Signing Plans

- Coordination with PennDOT and Local Officials