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Signal Sighting from the safety of the office using High Definition Video and 3D Virtual Models

This process can be stand alone or builds upon our Asset Mapping system where the footage is previously correlated to the chainage specified by the project.

Once a draft signalling plan is available,  Gioconda will integrate this information and build virtual signal structures. These are augmented onto the footage that will be used by the Signal Sighting Committee or be included in a full 3d model.

Our G-RAST software tool is used to assess HD Signals and Sighting Form input,  and the G-VST is used to view and manipulate the Virtual models.

The output of the Signal Sighting models can be projected through a High Definition Projector, allowing the Signal Sighting  Committee a clear office based view of the proposals. By using two or three projectors or HD screens you can also benefit by displaying the sighting forma and signalling plans to reduce the need for hard copies. We also suggest, as part of the SSC meeting, the use of an admin assistant to fill in the SSF’s during the committee meeting. These can then be printed & signed off on the day.

The Signal Sighting Module includes functions to step back from a signal or move to any position in the rear. At all times a readout of the chainage and distance in rear is displayed.

Obscurations can be assessed, along with minimum sighting distances and MRD can be calculated and automatically used. Where a full 3d model has been built we have full flexibility to change and edit any detail “on the fly”

The functionality of our software has been developed through use at numerous SSC meetings and is ideal for this situation.


  • Office based safe environment
  • Quick and repeatable assessments – allows more time to consider options
  • Switch between original footage & proposed scheme for assessment and planning
  • Images, files and associated notes can be linked to any known or proposed location
  • New layouts are modelled in 3d which complies to BIM
  • Screen capture with notes superimposed
  • All calculations and measurement required are inbuilt into the software
  • Forms the basis of a Driver Briefing Package


  • Calibrated good quality HD footage if it exists or we can capture this ourselves
  • Signalling scheme sketch or plan
  • Agreed chainage/meterage line
  • Aerial Imagery and maps
  • List of Proposed signal positions
  • Design drawings for remodelled sections

Real-Time editing – either as part of the proofing or during the SSC session a trained power-user can move and alter the signal positions and content using  our 3D application. 3D Signals and signage can be altered or swapped for alternative structures allowing for optioneering and for better sighting.

In most cases signals may be ‘signed off’ without the need for the whole committee to make a site visit. Where a signal is highlighted as a potential problem a site visit may be deemed necessary.

In either case, the SSC Chair should have visited the site or taken a CAB ride of the route for familiarisation.

The use of the G-RAST has obvious time & safety benefits. Recent Signal Sighting Committees have been able to examine in 15-30 signals in a day, as opposed to around 5 using traditional methods.


If SSC members have had no formal training in the use of Desktop Signal Sighting, Gioconda will provide an initial session to explain the accuracies, pitfalls and differences to alternative methods. This session will cover various issues including:

  • Positional  Accuracy
  • Signal Drift – why this is not an issue with the Gioconda system.
  • Visual Obscuration’s – how post processing makes this visually clear