Road Restraints Risk Assessment Process (RRRAP)

(updated 1st October 2020)

RRRAP v3.1 has now been introduced which synchronises the update of the Requirements for Road Restraints Standard (CD377).

Changes to v3.0

Terminology has been updated within the tool to reflect the DMRB update which was introduced on April 2nd. (If designing a solution to TD19, continue to use v3.0 of the tool selected at the landing page).
A facility to assess Expressways in England (highways designed to GD300) have been incorporated to futureproof the tool with new road classifications of D2E and D3E being introduced.
Temporary Barriers now have a fully functional assessment questionnaire (selected using the design reasons section)
allowing assessment of sites for periods greater than 28 days including the ability to print a full report displaying detailed results allowing for the preparation of MCHW Appendix 4-1 requirements

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.

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 CD377 'Requirement for Road Restraint Systems', which contains some mandatory requirements 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 onwards are cloud hosted tools.

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@nationalhighways.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.