Road Restraints Risk Assessment Process (RRRAP)
(updated 25th October 2019)
THIS CLOUD BASED TOOL IS ALSO NOW MADE AVAILABLE UPON REQUEST TO ANY ROAD DESIGN ORGANISATIONS FOR USE ON SCHEMES ON HIGH SPEED ROADS (50MPH AND ABOVE) THAT ARE NOT PART OF THE UK TRUNK ROAD NETWORK.
From Sunday 1st September 2019, ALL NEW SCHEMES on the UK high speed Trunk Road Network which comply with the implementation requirements of TD19/06 are required to be undertaken on RRRAP v3 which is hosted on the cloud (account application process below). The UK Trunk Road network consists of roads operated by Highways England and designated Roads operated in the devolved administrations of Scotland, Wales and Northern Ireland.
The Risk based Road Restraint Systems Standard does not follow the traditional standard format. The Standard has two parts that must be used together,
- The written Standard TD19 'Requirement for Road Restraint Systems', which contains some mandatory requirements but gives mainly advice and guidance and the
- 'Road Restraint Risk Assessment Process (RRRAP)', which enables the Designer for each site/scheme to establish the need for a vehicle restraint and, if so, its performance requirements.
The RRRAP provides the designer with a tool to assist in the provision of a safe road design for hazards that are sited adjacent to the carriageway. v3.0 is a cloud hosted tool.
The RRRAP tool provides the client an auditable record of the roadside in the form of a list of roadside furniture, structures, water hazards, roads, railways and other features which pose a hazard to errant vehicles that have left the carriageway. It also provides a record of the solution the designer has optimised through the process of hazard design, moving or removing hazards, specifying setback – working width combinations and benefit cost analysis for installation specification and future maintenance.
It applies site specific data to each hazard allowing the risk of impact and likelihood of occupant injury to be assessed for any hazard with multiple complex factors being applied which may influence the risk of life changing injury. Factors such as offset from the running lane, topography of the ground in advance of the hazard, the aggressiveness of the hazard itself and other factors such as bend severity, accident history, traffic volume, vehicle type balance and any effects on third parties.
The formulae within the RRRAP reproduce research findings reflect risk factors found in a number of research reports undertaken in the UK and Worldwide. These are summarised in the Errant Vehicle report also stored on this site. The outputs of RRRAP were benchmarked against IRRS and TD19/85 and have been developed through the continuous improvement process over the last 15 years. The RRRAP outputs provide a good basis for hazard mitigation solutions whether that is removal of the hazard, installation of passively safe furniture or protection with vehicle restraint safety systems. The provision of solutions meeting or exceeding current standards are subject to agreement with the client and the provision of solutions not meeting current standards require agreement with the overseeing organisation through the departure from standards process.
ACCOUNT APPLICATION PROCESS.
Each organisation will request a user name and password for their organisation by means of a nominated super-user who will administer access to their allocation of record slots to other designers within their organisation. All slots / records are accessible ONLY to the organisation to which they are allocated.
Super-users will be notified of their account details by email together with the location of the login page.
The organisation's super-user will need to demonstrate current and future scheme records or justify the issue of an account for other reasons (education, training or research purposes).
The number of slots allocated to each organisation will be made based on workload / expected users.
PLEASE NOTE: RRRAP is not a storage system, records should be downloaded / backed up on a frequent basis. It is required that once the design has reached the print off appendix 4-1 stage, the record is removed (or downloaded by csv file) to free up record slots.
APPLICATION REQUEST LAYOUT.
Send email request to:RRRAP@highwaysengland.co.uk
State ORGANISATION REGISTRATION REQUEST in the subject line
The email shall contain the following details : -
- Organisation Name / Division / Address / contact details
- An Organisational or Corporate Logo in gif format (100kB max) for the printing of reports.
- Reference for recent / upcoming work with Overseeing Organisation or other justification.
- List of schemes for which work has / is to be done.
- Name and contact details for Nominated Super-User (first point of contact for organisations users i.e. new accounts / password resets / technical queries)
- Name and contact details for deputy (in case of illness) for switching super-user role on request.
- No of schemes in next year
- No of users expected.
RRRAP Introduction Videos
Written User Guide (in-tool guidance is updated frequently)
Advice on the use of TD 19/06 in Northern Ireland
In Northern Ireland TD 19/06 and the RRRAP was implemented from 1st August 2007. For further information please contact the Engineering Policy Branch, Tel. 028 90540405.
Advice for Low Flow Trunk Roads in Wales and Scotland
The RRRAP allocates an aggressiveness value to each hazard adjacent to the road and quantifies risk by estimating the equivalent fatalities per vehicle km. For very aggressive objects adjacent to high speed roads, the RRRAP indicates that the provision of a Vehicle Restraint System (VRS) is required to lower the risk to an acceptable level, regardless of the traffic flow.
However, as traffic flow decreases the benefit/cost ratio of solutions also decreases. This is because although the overall risk decreases when a VRS is provided, the benefit is relatively small due to the relatively low number of accidents it prevents. Therefore, where two-way traffic flows are less than 5,000 AADT the designer should; assess whether the output from the RRRAP are practicable, if the benefit/cost ratio results warrant VRS provision and discuss their findings with the Overseeing Organisation.
This does not apply to the provision of parapets.
RRRAP v1.3a 2016 in excel format (discontinued for the high speed trunk road from September 1st 2019 except Temporary Barrier assessment for hazards within roadworks exceeding 28 days).
RRRAP v1.3a will continue to be available for high speeds roads which are not UK trunk roads and for Temporary Barrier provision to protect vulnerable or hazardous features adjacent to live lane traffic.
RRRAP v1.3a excel spreadsheet tool.
RRRAP spreadsheet user guide
If you have any questions or problems with the RRRAP then please consult the RRRAP problem check sheet for commonly encountered problems before contacting us.
This worked example is a spreadsheet with basic details already filled out such that it is validated as functional in being able to calculate those entries already populated. It can be used to verify IT system issues or examine problems with incorrect data entry by the user.