Carnell | VIDEO Safer, healthier and happier journeys for customers by on-site recycling of filter drain material
Maintaining the highway network by consistently delivering the basics well is one of the three pillars in Highways England’s Customer Service Strategy. We also know from Transport Focus research that a well-maintained network is a top priority theme for customers with surface condition and drainage condition identified specifically as areas of importance for customers.
With changing weather patterns, maintaining effective roadside drainage is a key component to meeting customer needs. The effectiveness of roadside filter drains gradually reduces over time as silt and fines from surface water runoff fill the voids between the aggregate. This gradually leads to an impermeable barrier building up in the filter drain, leading to increased risk of standing water on the carriageway and subsequent increased accident risk for customers. In addition, ignoring the problem can lead to early deterioration of the road surface and carriageway sub-base layers, reducing the life span of the pavement.
Traditionally when renewal is required, existing filter drain material would be removed and disposed as contaminated material with new virgin material imported to maintain optimum performance of the roadside filter drains. Carnell’s STONEmaster breaks this mould and through on-site recycling, returns existing filter drain material to its optimum performance condition.
In the last five years, 2015-2019, Carnell have recycled 265,477m3 of roadside filter drain material across the strategic road network. That’s the same volume as 106 Olympic sized swimming pools. As well as delivering strong sustainability performance against the UN’s Sustainable Development Goals, this has locked in long-term customer benefits.
Satisfaction with journey times
STONEmaster reduces the need to import new filter drain material or return cleaned filter drain material that has been recycled off site. This delivers a 79% reduction in lorry journeys, travelling between quarries and construction sites. In the last 5 years that is estimated to have removed 1.4 million construction related transport miles from the network. That’s the same distance as travelling round the Earth over 56 times or driving the entire Highways England network over 325 times. This reduces delays for customers and helps customers feel safer and more in control of their journey, leading to a happier overall customer experience.
Better air quality
The 79% reduction is estimated to have removed 53,095 lorry movements to and from construction sites, by not needing to export excavated material and import new replacement material. These lorries stacked end to end would stretch for around 395 miles, a similar distance as travelling between London and Edinburgh in a car. Removing the emissions of all these vehicles travelling to and from site, significantly improves the air quality for communities adjacent to transport routes as well as pedestrians and cyclists using the road network, leading to healthier customers.
Improved road safety
Effective and fully functioning filter drains are a vital safety component by managing the risk of flooding on the network. STONEmaster recycling re-establishes the effectiveness of roadside filter drains 2-3 times faster than conventional dig out and replace methods. This delivers a greater treated length for every pound spent. Allowing surface water to drain from the carriageway quickly, reduces the risk of flood related accidents and incidents, improving customer safety.
Carnell were a recent finalist in the 2020 UK Customer Satisfaction Awards run by the Institute of Customer Services, with a focus on understanding and addressing customer needs. On site recycling of filter drain material has a proven track record of improved outcomes all-round. In particular, the process ensures safer, healthier and happier customers, supporting positive customer experience and improved customer satisfaction levels.