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RHD Operational Procedure – Technical Services Wing
Road Design and Safety - Road Safety Division
OP/RDS/3.2 - Design of a Road Safety Improvement Project
Purpose and Scope :

This procedure describes the process for the production of scheme plans and a report for a road safety improvement project. The procedure includes for the collection of all necessary and relevant data, site inspection, evaluation and analysis of the data, the identification and assessment of improvement options, and the preparation of scheme plans and report.
Definitions :

Road Safety Improvement Report - The outcome of this procedure.

RSC - Road Safety Cell, BRTA. The RSC is the custodian of the National RTA Database. The contact details for matters relating to the RTA Database are: The Manager, Road Safety Cell, House 10A, Road 25A, Banani, Dhaka. Attention: Accident Data Analyst.

The meaning of acronyms used for common terms are described in the glossary at the beginning of this Manual. Other acronyms used in this procedure are:

RTA - Road traffic accident.

TMC - Turning movement count.
Responsibility :

Superintending Engineer - Road Design & Safety Circle - Responsible for instigating the instruction to determine road safety engineering improvements for a specific project area, route or location, based either on instructions received from the Additional Chief Engineer-TSW or on his/her own initiative, either as part of a road safety programme, or as an outcome of the Annual Road Safety Engineering Report, or similar. The SE-RDS is responsible for implementing the Report’s recommendations.

Executive Engineer - Road Safety Division - Receives the instruction to design road safety improvements and has overall responsibility for the procedure and for the design of the safety improvements and production of the scheme plans and report. The EE will assign the SDE-RSD and/or an AE-RSD to complete the tasks, which form the procedure, and the EE will commission the procurement of consultancy services, if needed. The EE must be familiar with the site and must have visited it at least once within the year prior to the identification of improvement options. The EE should visit the site prior to the finalisation of scheme plans.
Method :

The procedure is easily divided into several phases, namely, data collection; site inspection; evaluation and analysis; option identification and assessment; scheme plan preparation; and reporting.


Data will need to be collected from several sources and should include at least the following:

· RTA data

· GIS information and site plans

· HDM & road inventory data

· Land use planning data

· MV & NMV traffic volumes counts (7-day and peak period); classification and TMC data

· Pedestrian volume counts and pedestrian density data

· Construction costs; economic costs of RTAs; costs for land acquisition & resettlement

· Records of recent and details of planned roadworks in the site area

Operational Procedure OP/RDS/3.1 describes the process for collecting RTA data from the RSC. All other data should be sourced initially from other Wings within the RHD (the Planning & Maintenance Wing, HDM Circle and Planning & Programming Circle, and the Bridge Management Wing, Planning & Data Circle) and from the Road Design & Standards Division. Land use planning data may also have to be sourced from other departments or Ministries. More than likely, the data collected from the RSC and the RHD Wings will have to be supplemented with on-site surveys. These can be carried out either by TSW staff or by consultants commissioned specifically for that purpose. The direct hire of labour for on-site surveys does not produce reliable results and should only be used in special circumstances.


Site inspection by the RSD staff is an important and necessary part of the design procedure. A site inspection must be carried out at the data collection phase with the purpose of making an initial assessment of road environment, travel demand, traffic conditions, roadside land utilisation and RTA occurrence.

The initial site inspection should include on-site discussions with the Zone Superintending Engineer. During the initial site inspection, discussions with the Thana Police and casual interviewing of persons in the area will supplement the observation of traffic conditions, travel demand and potential conflicts, may be useful in determining the actual incidence of traffic accidents in the area of interest and the identification of road user movement patterns and conflict locations. An evaluation of travel conditions at different times and under different climatic and seasonal conditions should also be undertaken during the site visit. All this is essential information for the determination of effective road safety improvement schemes.

Desirably a second site inspection should be made prior to finalising the draft options and scheme plans. There is merit also in inspecting the site during the process of identifying the road safety improvement options or interventions.


The data is to be evaluated and analysed to determine road safety engineering improvement options, which must be quantified and costed. Draft scheme plans of the improvement options are to be prepared as the basis for quantity estimation and for inclusion in the final Road Safety Improvements Report. Costs must include not only all construction and supervision costs, but also the cost of land acquisition & resettlement, if required.

The data is also to be evaluated and analysed to assess the expected change in RTA occurrence as a result of the improvement or intervention. Scheme benefits will be determined as the assessed change in the economic cost of RTA occurrence.

The IDC Road Safety Engineering Procedure Notes contain useful guides for the evaluation and analysis of data for the determination of road safety improvements.


Normally, road safety improvement projects will be commissioned for sites where there is a clustering of fatal accidents, commonly referred to as “black spots”, and typically they will be sites where there are conflicts between different categories of road users. It is important in the determination of safety improvement options that the travel demands of all road users are considered. It is also important to look outside the site area to ensure that the safety improvement works will fit with the overall function of the road corridor(s) and to identify any potential for accident migration.

Options may be assessed on the basis of their capability to achieve improved safety, which may include a sensitivity analysis, and on the basis of an economic (cost/benefit) analysis.

The services of the RDS Division may be required for the drafting and production of scheme plans.


The final outcome of the procedure for designing a road safety improvement project is the report, which can contain options but must recommend a preferred option. The Report must contain recommendations for further action, probably in the form of including the preferred option in an annual construction programme or including it in a special programme for immediate implementation. The SE-RDS is responsible for implementing the Report’s recommendations.

In some cases, there may be no viable option, in which case a report should still be produced but with justification for such a conclusion.

The Road Safety Improvement Report is initially prepared as a draft and issued by the EE-RSD to the SE-RDS and the ACE-TSW. Following receipt of comments the report is finalised and distributed by the ACE-TSW to the Zone ACE and the ACE-Planning & Maintenance Wing (and Bridge Management Wing, is appropriate) with a copy to the Chief Engineer.
References :

· RHD Operational Procedure for the Collection and Processing of Road Traffic Accident Data, OP/RDS/3.1

· Road Safety Engineering Procedure Note 1: Identifying Hazardous Locations in Bangladesh – Site Selection Techniques (RRMP2, IDC)

· Road Safety Engineering Procedure Note 2: Treating Accident Black spots in Bangladesh (RRMP2, IDC)

· Road Safety Engineering Procedure Note 3: Route Studies in Bangladesh (RRMP2, IDC)

· Geometric Design Standards of Roads & Highways Department, July 2001

· Traffic Signs Manual, Volumes 1 & 2 (BRTA)
Procedure Flowchart :

The procedure flowchart for this procedure is detailed below -




For duties associated with each grade of personnel see


Updated on : 1/12/2003