Interstate-75 Cross-Slope As-Built Survey

Location: Florida; United States; North America

On this highway widening project, Cardno verified existing project horizontal and vertical control benchmarks on three miles of the six-lane interstate highway. Cardno’s examination of the road’s side slopes demonstrated the need for more asphalt surface than had been planned. 

Cardno set additional control at 400-foot intervals, along the centre-line of the construction area, to ensure adequate coverage to use a Laser Scanner. Quality Assurance (QA) checks were conducted every 400-ft on the scanning data using conventional surveying techniques.

Cardno delivered a digital-terrain-model (xml format) of the north-and south-bound pavement surfaces created from the as-built data. The team developed an automated process to cut cross-sections every ten feet from Laser Scanner data and produced hardcopy “As-Built Survey Maps,” illustrating project control and cross-section details.

An innovative use of LASER Scanner to evaluate cross-slope on newly constructed asphalt surface generated a final report in less than a week, despite working on a busy, six-lane, large-scale roadway corridor. Cardno completed its work without disrupting traffic and minimally encroaching traffic lanes by field personnel using the appropriate technology to ensure safety.

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