1. PRACTICAL ROAD SAFETY ENGINEERING
Road Safety Audit Workshop 10 July 1018
Louis Roodt Pr Eng PhD

2. RSA is the Republic of South Africa
The acronym RSA is one of 96 listed on that includes
Repair Service Attendant
Road Side Accident
Rural Service Area
Road-Side Assistance
Retirement Savings Account

3. An appropriate Road Safety Audit acronym??
Research Society on Alcoholism
Responsible Serving of Alcohol
Russian Space Agency
Red Star Army
Propose RSAudit

4. Clients’ expectations from RSAudit
SANRAL wants findings for high and extreme risk

6. Clients’ expectations from RSAudit
SANRAL wants findings for high and extreme risk
Clients want design check
Clients want to pass risk to the auditors
Consultants want design check
Road safety assessment as part of audit

7. Practical engineering questions
What to report if there is no safety risk: good design
What to report if the design report adequately explains the design exemptions
What to report if the design standards are known to be high (SSD based on h=0.15)

8. Personal preferences of auditors
Are human
Have personal experiences
Have specific knowledge
What is yours???

9. Personal preferences of auditors
Slipways and intersection angles

10. Personal preferences of auditors
Slipways and intersection angles

11. Personal preferences of auditors
Trees next to road

12. Practical aspects of RSAudit
Site visit relevance and context
What if the existing road is completely redesigned
Extreme hazards to be reported
Separate letter
Maintenance laxities
Road signs and markings
Vegetation

13. Preliminary design issues 1
Rest areas
Tourism facilities e.g. Kaaimans lookout
Lay-byes
Vegetation
Landscaping on medians
Mist belts
Access control

16. Preliminary design issues 1
Rest areas
Tourism facilities e.g. Kaaimans lookout
Lay-byes
Vegetation
Landscaping on medians
Mist belts
Access control

17. Preliminary design issues 2
Auxiliary lanes
Separation of low-speed and high-speed traffic
High-speed two-way traffic
Rural four lane roads: divided or not
Lane widths
Shoulder widths

18. Preliminary design issues 3
Lack of recovery area / lateral clearance
Low Fill
Cut with side drain
Culvert head walls
Drainage
Superelevation

20. Issues relating to roadworks and traffic accommodation
Standards details
Project specific exceptions
Separation of workers
Detours
Delay at one way working

24. Good practice and standard details 1
Guardrails: lengths and starts, end treatment
Hazard markers and chevrons
Bridge balustrades and transition from guardrails
Protection for bridge piers
Location of bus and taxi stops
Universal access

27. Good practice and standard details 2
Wrong markings
Consistent signage
Signage at T-junctions: line of sight or offset?
Signage at roundabouts
Landscaping on roundabouts
Pedestrians at roundabouts

32. High risk issues in detail designs 1
Slipways: high and low speed designs
NMT / pedestrian accommodation at slipways
NMT / pedestrian accommodation at roundabouts
Tapers
Oblique intersections for trucks

33. High risk issues in detail designs 2
Ribbon development
Schools
Transitions rural to urban
NMT / Pedestrian facilities
Public transport
Rail crossings

35. RSAudit response Lack thereof Inadequate feedback
No design exceptions registers
No institutional memory of good practice

36. Way forward? Sharing information High standards of design
Ultimately out of work
The End