AQUAPLANING AND TRAFFIC SAFETY ON HIGH SPEED ROADS …cbrcbrasvias.com.br/palestras/arquivos/Pal 27...
Transcript of AQUAPLANING AND TRAFFIC SAFETY ON HIGH SPEED ROADS …cbrcbrasvias.com.br/palestras/arquivos/Pal 27...
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IRF Brazil Conference. October 26th, 2011. Iguazu Falls, Brazil
AQUAPLANING AND TRAFFIC SAFETY ON
HIGH SPEED ROADS
Juš Žnidaršič, Project manager, Asfalteks d.o.o.
Decreasing the water film thickness with
diagonal grooving
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IRF Brazil Conference. October 26th, 2011. Iguazu Falls, Brazil
0. CONTENT
1. Background and Introduction
2. Objectives
3. Solutions
4. Solution Implementation
5. Evaluation of Results and Next Steps
6. Acknowledgements
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IRF Brazil Conference. October 26th, 2011. Iguazu Falls, Brazil
1. Introduction
- High number of accidents are caused by water present on the road surface
- Water film aquaplaning effect lost of adhension
- Higher risk of aquaplaning effect in cross slope transitions
- Diagonal grooving for succesfful drainage and increased adhension
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1. Introduction: water film
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IRF Brazil Conference. October 26th, 2011. Iguazu Falls, Brazil
2. Objectives
- Increasing road safety by preventing water film on the road surface
- Increasing drainage in the solid screwing zone
- Increasing adhension between pneumatic tire of the vehicle and road surface
- Time and cost efficent technology to achieve above objectives
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IRF Brazil Conference. October 26th, 2011. Iguazu Falls, Brazil
3. Solutions
- Permeable asphalt surfacing, without additional sub-base drainage
- Surface grooving
- Diagonal grooving
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- One of the most sufficent methods for reducing aquaplaning in areas of
insufficient roadway drainage
- Water film in cross slope transitions permeates the structure of the
surface into which a system of grooves has been cut
- Roadway grooving : Mechanically cutting grooves into the roadway
surfacing
3.1. DIAGONAL GROOVING
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3.1. DIAGONAL GROOVING
- Cutting grooves into the roadway surfacing
(roadway grooving)
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- The water film is absorbed into the system of grooves below the
contact surface between the road and the tires
3.1. DIAGONAL GROOVING
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- Distribution of sistem of
grooves on the road
3.1. DIAGONAL GROOVING
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- Diagonal grooving on the
bridge
3.1. DIAGONAL GROOVING
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4. SOLUTION IMPLEMENTATION – Roadway grooving model
- Angle of grooves:
45 º
- Distance of bands:
2 – 5 m
- Width of bands:
30 cm
- Depth of grooves:
5 – 6 mm
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4. SOLUTION IMPLEMENTATION
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The durability of grooving in asphalt pavements:
- asphalt type
- asphalt composition
- type of stone aggregate in the asphalt
- traffic load
4. SOLUTION IMPLEMENTATION
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The durability of grooving in asphalt pavements:
- stone mastic asphalt (SMA): at least four years (up to six)
The durability of grooving in concrete pavements is much longer
4. SOLUTION IMPLEMENTATION
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4.1. Important details for successful drainage
- Denivelation of asphalt
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4.1. Important details for successful drainage
- Solution for denivelation
of asphalt
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4.1. Important details for successful drainage
- Insuficient maintainance
of road and drainage
sistem
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4.1. Important details for successful drainage
- Grooves filled with
material
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4.2. Accident analysis on Croatian highways
- Three grooved sections of the Rijeka-Zagreb motorway have been
analysed.
- The following diagrams show the number of road accidents before and
after grooving.
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4.2. Accident analysis on Croatian highways
Nu
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acc
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4.2. Accident analysis on Croatian highways
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acc
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4.2. Accident analysis on Croatian highways
Nu
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acc
iden
ts
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- According to the analysis, the average number of accidents was 3.53
accidents per year before grooving and 0.67 accidents per year after
grooving, i.e. the number of accidents has dropped by 81%.
4.2. Accident analysis on Croatian highways
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IRF Brazil Conference. October 26th, 2011. Iguazu Falls, Brazil
5. EVALUATION OF RESULTS AND NEXT STEPS
- Diagonal roadway grooving proved to be a simple and efficient way to reduce
aquaplaning effect on roads
- Time (500m in 8-9 hours) and cost efficent
- Further development of grooving technology for faster implementation
- Road analysis before and after grooving showed that grooving reduced the
number of road accidents in critical areas by as much as 80%.
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IRF Brazil Conference. October 26th, 2011. Iguazu Falls, Brazil
Juš Žnidaršič, Project manager
Asfalteks d.o.o.
Letališka 33,
1000 Ljubljana,
Slovenia, EU
6. ACKNOWLEDGEMENTS