Main Features

  • Standardized System for traffic actuated controllers
  • Synchronizing of controllers
  • Assignment of priority, especially for public transportation
  • Available for many current controllers
  • Fully traffic actuated signal control software
  • High flexibility, developed for general purpose traffic and transit needs
  • Powerful and versatile transit priority functions that do not require involvement of firmware vendor
  • User-friendly graphical user interface for development, debugging and evaluation
  • Identical software for
    • simulation (VISSIM, Aimsun, Paramics)
    • controller implementation (2070, Siemens, PEEK, etc.)

The VS-PLUS Control Philosophy

  • Optimized control transparent to road user
    • Short loss times resulting in low environmental impact
    • Green in an reasonable amount of time
    • Road user should not be kept waiting for no apparent reason
  • Operation of signal control with:
    • minimum of cost and manpower
    • highest possible quality of control
  • Control types
    • fully traffic actuated control
    • semi-coordinated control
    • fixed time control


  • Fully traffic actuated control
  • Traffic control designed for transit signal priority (TSP)
  • Free phase combination and sequence (important for priority driven control)
  • Unlimited number of phases
  • Highly flexible transit priority based on
    • route and trip identification
    • lateness or user defined priority code
  • Proven control package, more than 1,000 installations
  • Full integration with design and test tools

VS-PLUS Transit Signal Priority Treatment

  • Multiple levels of priority treatment
    • Transit vehicle’s lateness (in minutes) or user defined priority code
    • Competing transit priority calls
    • Special treatment of trailing trains/buses (bunching)
    • VDV communication protocol
  • Multiple calling points
    • 2 advance calls
    • Confirmation
    • Checkout

VS-PLUS Implementations in North America

  • Advanced Traffic Controller (ATC) Type 2070
  • Meets latest CALTRANS standards
  • Open architecture
    • Off-the-shelf operating system
    • Non-proprietary computer architecture
    • Open communication protocols
  • Currently available from multiple vendors
  • Open for implementation on other controller types 

More Information