4. Key approach to maintenance decision support
…built up on expert
knowledge of
processes between
atmosphere and the
pavement
↘ Sophisticated
perspective of future
road conditions
4 Maintenance Decision Support System
5. Definition and motivation
• Complex road weather forecasting system
• Precise short-term local forecast of road slipperiness
• Synthesized and clear graphic information so the
decision-making is truly simplified
5 Maintenance Decision Support System
6. MDSS key features
• Integration of all relevant information sources
• Every hour
• With 1 hour step
• For upcoming 24 hours
• For each 1 km of the road network
6 Maintenance Decision Support System
7. Maintenance Decision Support System
Local geodatabase Online package
Thermal mapping Weather prediction model
Geographical info Weather stations
Expert information Maintenance data
Traffic flow data Floating Car Data
Road construction Traffic flow data
7 Maintenance Decision Support System
8. Thermal mapping of the road surface
• Full-featured utilization
• Spatial variations of minimum night-time road surface
temperature
• Highest spatial detail compared to other sources
8 Maintenance Decision Support System
9. Maintenance data
Road condition
Road condition
9 Maintenance Decision Support System
10. Model outputs
• Road condition Dry
• Road surface temperature Moist, wet
Snow
• Snow amount Drifting snow – warning
• Freezing point
Drifting snow – alarm
Slipperiness
Hazardous
10 Maintenance Decision Support System
11. Selective maintenance
• Basic processing unit is road stretch of 1 km length
• Accurate local prediction of road slipperiness
• Precisely targeted maintenance intervention on
particular risky place within the road network
11 Maintenance Decision Support System
12. MDSS in the Czech Republic
• Highways 250 km • 2007 - 2011
• Ist class 1537 km • 5900 segments
• IInd class 3960 km • 70 + 25 weather sites
12 Maintenance Decision Support System
13. Regular accuracy evaluation
• Temperature error in first 4 hours of forecast
• Season 2009/2010 in the Pardubice region
No. Tolerance
cases
55 % ± 1 °C
78 % ± 2 °C
96 % ± 5 °C
13 Maintenance Decision Support System
14. Mean and mean absolute error in road surface
temperature forecast in 2009/2010 in the Pardubice
region for all road weather stations
14 Maintenance Decision Support System
15. Error in road condition forecast in 2009/2010 in the
Pardubice region for all road weather stations
15 Maintenance Decision Support System
18. Ready-made extensions
Maintenance map Station forecast graphs
• accumulates maintenance • for all stations in a region
data from last several hours
to show the overview of
performed treatment
18 Maintenance Decision Support System
