Lexington Traffic Signal System

Adaptive Computerized Signalization System

The Town of Lexington is installing a networked, computerized traffic signal system designed to ease congestion and improve traffic flow.

  • The $4.5 million project is made possible through Central Midlands Council of Governments COATS
    Guideshare funding.
  • 35 traffic signals throughout town limits and major intersections adjacent to town, helping ease congestion in a community that sees up to 40,000 vehicles a day at many intersections on an average weekday.
  • Economic Benefit: estimated $1million savings per corridor/per year in time and fuel
  • Fewer Crashes: Reduces accidents by 30%
  • Gas Savings: 20-30% less fuel consumption
  • Fewer Stops: 90% less stops at intersections
  • Shorter Commutes: 50% less travel time
  • Cleaner Air: 20-30% less emissions

How an Intersection Works

  • Detects the approaching and standing vehicle using cameras and other sensors
  • Adapts to local traffic demand using digital technology
  • Develops the most efficient way to move traffic using a “greedy” algorithm.
  • Serves minor streets during “gaps” in major streets

Phase I

  • Construction should last approximately nine – ten months.
  • System is expected to be fully operational by the end of 2015.

Phase II

  • Includes the remaining 16 signals and is expected to go to bid as soon as right of way issues are
    resolved.
  • Construction should last approximately nine – ten
    months.

Contact Information:
D. Britt Poole
Administrator
Town of Lexington
803-951-1665
bpoole@lexsc.com

Currently in the design phase. The project has been divided into two phases.

  • Phase-1 will include 19 of the 35 signal locations and is planned to bid November 10, 2014.
  • Phase-1 anticipated Notice to proceed will be approximately February 1, 2015.
  • Phase-1 construction should last approximately 9-10 months.
  • Phase-1 system is expected to be fully operational by the end of 2015.

Operations and Benefits
Locally:

  • Detects the approaching and standing vehicle using cameras
  • Adapts to local traffic demand using digital technology
  • Develops the most efficient way to move traffic using a “greedy” algorithm.
  • Constantly measures the volume
  • Focuses on minimizing the delay or wait time
  • Serves minor streets during “gaps” in major streets

Globally:

  • Optimizes the traffic corridor to experience as few stops as possible
  • Coordinates with signals downstream the volume of traffic in queue
  • Considers the amount of travel time needed between signals
  • Creates “green tunnels”
  • Serves minor streets during gaps on major street traffic
  • Serves left turns (only when needed) at beginning or end of the green tunnel

Benefits:

  • Improves travel time
  • Reduces accidents
  • Reduces fuel consumption and emissions
  • Eliminates constraints on current signal operations and timing
  • Operates signal “intelligently”

Table below lists intersections and phasing

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