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Capability Assessment Toolkit 3
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Whole Life Cost-Benefit Analysis for Median Safety Barriers Task 1 - Relocation of Services - Executive Summary
Introduction
TRL Limited has been commissioned by the Highways Agency to evaluate and report on the true costs associated with the relocation of services (drainage, communication cables, electrical cables, lighting columns etc.) in the median when replacing steel safety fences with concrete safety barriers.
Executive Summary
TRL Limited has been commissioned by the Highways Agency to identify, investigate and report on a number of case studies in which a relocation of services has been required within the median.
In order to obtain detailed information relating to such relocation, one area of the Highways Agency's Network, the M25 Sphere, was identified, and details of Works involving the movement and/or replacement of services were collated. From this list of case studies, the following were selected for further analysis:
- Replacement of drainage and safety fence (like-for-like);
- Replacement of drainage and safety fence (Tensioned Corrugated Beam to Open Box Beam);
- Replacement of metal safety fence with concrete barrier, and associated works;
- Crack and seat and overlay of the carriageway and installation of concrete barrier in the verge;
- Replacement of drainage and safety fence (Tensioned Corrugated Beam to Open Box Beam);
In each case, details of the Works completed were collated and the associated costs obtained.
In addition a letter was also distributed to all of the Highways Agency's regional Traffic Operations Departments, their Agents and their Term Maintenance Contractors.
The report concludes that the costs associated with an incident are highly dependant on the impact parameters surrounding the incident, and the costs associated with the individual costs associated with repairs, traffic delay and the severity of the resulting injuries caused by the incident. Each potential hazard should be assessed on a case-by-case basis and each of these factors quantified using a statistical approach, including the implementation of a risk analysis procedure.
