Civil Engineering

Innovations that show the way
We continually look for better ways to do things. We’re not afraid of a challenge and we take the lead in proposing innovative and practical solutions.

You can rely on our programme of innovations to make things safer, smarter and more efficient

That applies whether we’re revolutionising the speed and cost of drainage surveys, dramatically extending the range of continuous GPR scanning, deterring dangerous driving, cutting vehicle movements and emissions in roadside filter drain refurbishment, reducing hazardous stone scatter, or providing vital asset management information.


Road workers are continually exposed to hazards associated with traffic and movement of vehicles on site.

SafetyCam is a mobile road worker protection system that fuses image, video and Automatic Number Plate Recognition (ANPR) technology with state of the art processing and reporting techniques. It aims to improve the safety of road workers by improving driver behaviour in and around work sites.

SafetyCam utilises two camera systems – one to monitor and report on the speeds of passing site traffic and one to record beginning to end submissible footage of unauthorised vehicle incursions into road works. As well as hosting both specialist camera systems and on-board Wi-Fi capability, SafetyCam is a fully resourced and functional site welfare vehicle that is available for use by all.


A market first in providing on-site refurbishment of roadside filter drains.

By recycling the filter media in-situ, only material not conforming to Type B specification is removed from site, whilst drains are left functioning fully.

Fewer HGV transfers, minimal import from quarries & loads to landfill ensure that the StoneMaster process is both an environmentally sustainable and cost-effective method of prolonging asset lifespan.

Filter drains operating at their optimum performance level effectively remove surface run-off and sub-base moisture, to ensure roads are safer and last longer.


Launched in 2012, SmartScan was developed to provide a quicker, safer and more cost-effective indication of filter drain condition. Ground Probing Radar is utilised in a unique way to indicate the porosity of filter drains, and when combined with vacuum-extracted samples, and video of the surface gives a comprehensive condition assessment.

SmartScan is a rolling survey, allowing lengths of up to 40km to be surveyed in one shift; under the protection of an IPV instead of a static lane closure.

Unlike trial holes at regular intervals, SmartScan gives continuous data for the full length, is safer for the road worker and offers best value for the client.


Carnell are working with suppliers to decarbonise compounds and the plant used on schemes for National Highways. This approach has seen us lead the industry in adopting best practices which reduce not only the carbon footprint, but also fuel costs and the effect of noise and air pollution on local communities.

In January 2022, we calculated that by using sustainable solutions such as HVO fuel, solar hybrid generators, solar tower lights and solar CCTV security cameras in one of our standard compounds, we would reduce CO2e emissions by 6,346kg.

Find & Fix

Find&Fix enables asset holders to quickly collect safety-critical drainage condition data and provide targeted risk-based interventions on their network. We work in collaboration with our clients to deliver their optimum solution, using our unrivalled range of survey, remediation and GIS technology.

Carnell have designed several survey and remediation packages which deliver quick and  cost-effective solutions to improve the functionality of network drainage assets performance  and extend their lifespan.



CleverScan is an intelligent chamber laser (& video) scanning system which is used to record all drainage chamber details for a CS 551 compliant ‘Chambers Defect and Geometric Survey by Laser Scanner’.

By reducing the need for confined-space entry into the chamber and manual data-entry, it is a safer, quicker and more accurate way to survey drainage chambers.