Case study: Buried tram tracks

  • Site: Urban multi-lane road, approx. 5km length to be investigated
  • Objective: Determine if tram tracks from defunct network were buried under road, and if present map locations
  • Approach:
    • Kerberos used to scan accessible highway pavement and intersection turnouts at traffic speeds
    • Scanning performed without traffic control, within normal traffic flow
  • Outcomes:
    • Approx. 4 hours of daytime + 2 hours night time to scan site
    • Traffic control not required
    • Tram tracks were confirmed to be present under the road in various location
    • Locations clearly visible within 3D GPR data
    • Boundaries of tram tracks tagged in software & exported for reporting to client
    • Assessment completed without any pubic disruption
  • Client benefits:
    • Confidence: Tram tracks were visually clear and unambiguous within GPR data, giving confidence that they had been reliably identified
    • Clarity: Use of 3D GPR enabled extent of tram track locations to be precisely identified & reported
    • Coverage: Majority of site covered with road-based scanning, providing confidence to proceed with project planning in these areas
    • Cost & time: Majority of site covered in a fraction of the time and cost of slower 3D or 2D GPR technologies
    • Delay & disruption: Traffic-speed 3D GPR collection avoided the significant costs & public disruption of traffic control measures