The flow chart below gives a brief explanation of each stage of the engineering process.
A collision map is created for each site (click on the link below to see an example of this collision 'plot').Collision Plot (PDF - 1.5MB)
After construction, engineers from LRSU visit the sites to make sure everything is to standard and to take photographs. The number of collisions at the site is monitored for the next 36 months. Engineers then use this data to check that the engineering measures are working as they should and that collisions have reduced.If any road safety issues remain during the monitoring period, further investigation will take place.
Engineers work in three Teams, covering North, Central and South London boroughs.
Waltham Forest, Redbridge, Havering, Barking and Dagenham, Newham, Hammersmith and Fulham, Hounslow, Hillingdon, Ealing, Brent, Harrow, Barnet, Haringey, Enfield.
City of London, Westminster, Camden, Islington, Hackney, Tower Hamlets, Southwark, Lambeth, Wandsworth, Kensington and Chelsea.
Greenwich, Lewisham, Bexley, Bromley, Croydon, Sutton, Merton, Kingston upon-Thames and Richmond-upon-Thames.
The estimated cost of an urban injury collision (including an allowance for damage-only collisions) is £93,531 at 2008 prices. When LRSU engineers recommend engineering measures, they look at how many collisions might be prevented if the scheme is installed. This allows them to calculate the estimated financial saving of a scheme. The physical, social and emotional consequences cannot be quantified.
The planning unit is responsible for coordinating all improvement schemes on the TLRN. When a road safety engineering scheme is passed to them, they look to see if any other schemes are being installed in that area, or if TfL are doing any other work at that location. They can also prioritise schemes.
Once an LRSU collision study has been completed it is passed to RNM. Recommendations made by road safety engineers are looked at by RNM and taken forward through production of detailed designs (this has to be completed before a scheme can be installed).