PUBLIC TRANSPORT, Germany, Herford

Municipality of Herford, 2007


Together with the public transport company of Minden-Ravensberg, the municipality of Herford carried out a weak point analysis to gather data about ineffective time in public transport. The results showed actual ineffective times on various lines and as a consequence the different operators of the traffic signal systems - the district and city of Herford, the road construction department of North Rhine-Westphalia and the public transport companies - decided to improve attractiveness and cost efficiency with the implementation of a modern public transport prioritisation system.

For this purpose Signalbau Huber (now SWARCO TRAFFIC SYSTEMS) replaced 36 traffic signal systems with ACTROS and installed a new VRS 5000 traffic management system.


Public transport priority - mode of operation

Buses register at ACTROS traffic signal systems via radio telegram. This information is used by the real-time-traffic control software of the traffic controllers: In suburban areas the buses get full priority. In the city center, where progressive signal systems are in operation, a "soft" prioritisation mode is used. This means that the green phases for buses are triggered between 10 and 15 seconds earlier and last longer than for regular traffic.

ACTROS traffic control technology

  • ACTROS controllers with modified user interface
  • Public transport module KSR 2002 installed in the rack top part with access via the smaller rack door
  • OCIT interface
  • Standard modem LOGEM 28,8 connected via customer-side telecommunication cable
  • Data log storage functionality of the controller (implemented via enhanced OCIT-archives within the OCIT component)
  • Radio clock synchronisation
  • NTP (Netware Time Processing)

Traffic signal control

  • Creation of TL-files according to the customer's scheme
  • Convertion of the TL-files to LISA+ planning files for ACTROS controllers
  • Remote supply of parameters
  • Remote supply of fixed times
  • Changing of variables
  • Remote supply of logics
  • Remote supply of phase transitions

Design of traffic computer

  • Traffic computer VRS 5000
  • OCIT interface
  • Hardware installation based on components; enables easy modification and upgrade at any time
  • Two operating terminals
  • Laptop with newly developed "local tool" with identical user interface
  • Connected to the traffic control system of the fire brigade, implementation of the radio commands using an industrial PC, connected to the main computer via modem

Software components

  • Operating systems (Windows, Linux)
  • Third-party standard software (drivers, applications, ...)
  • System software UniComp
  • Access and user control
  • Traffic signal software
  • Log and fault indication function (archiving, analysis)
  • Fault indication messages via SMS
  • Web-based user interface
  • Network map, incl. visualisation of current phases
  • Online node-based signal plan
  • Graphical visualisation or tables
  • Operation statistics (storage, analysis)
  • Visualisation of public transport data, quality analysis
  • Data archive and backup functionality
  • Traffic counting (storage, load curve, progressive signal view)
  • Database (MySQL or Oracle)
  • Online-help
  • Time switch (server)
  • Time switch visualisation and configuration
  • OCIT - traffic light control
  • OCIT - installation interface
  • Interface for data exchange between OCIT-conform controllers
  • Interface to third-party detection systems (RBL)
  • Software module for the visualisation of progressive signal systems
  • Software module traffic-actuated programme selection
  • Interface to operator workspace LISA+