Road weather models for increased traffic safetyTorbjörn Gustavsson & Jörgen Bogren

Road Climate Centre

Göteborg University

Sweden

Past

1983

Present The problem The possibility

2005

How RWIS-data is used today

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-1,8°C

+10°C

Is it necessary to perform any maintenance activity???

The problem

• A lot of data is measured– 700 stations– several sensors– quality– representativity

• Interpretation requires good knowledge and integration with other sources

MDSS – maintenance decision support system

Information not data

-For road stretches

-About road conditions

-Overview or detail

-Interpreted

MDSS- summary

Integrate information from different scales and sources in order to give information about the prevaling conditions and a forecast for the next hours

Information to drivers

• About road conditions• Speed limits in

relation to severity– Snow– Ice– Rain– Fog– Wind

Information to drivers

Weather model

-Data from several RWIS-stations

-Thermal mapping

-Topoclimate

INPUT PROCESSING OUTPUT

60 – 120 km/h

Control measurements

E22, 1 Mars kl 08:50

0

0,1

0,2

0,3

0,4

0,5

0,6

0,7

Avstånd (long)

Fri

ktio

n

Frequency of alarms due to snow

  Alarm1 Alarm2 Alarm3 Alarm4 Total

E22 2003/2004 2,2 0,2 0,3 0,3 3,0

E22 2004/2005 3,3 0,4 0,2 0,3 4,2

E18 2003/2004 3,8 0,5 0,5 1,4 6,2

E18 2004/2005 3,7 0,5 0,5 1,1 5,8

Mean 3,2 0,4 0,4 0,7 4,8 

A0= 110 km/h: A1= 90km/h: A2= 80 km/h:

A3=70 km/h: A4 =60 km/h

Best practices regarding RWIS-development

Maintenance tool

Maintenance decision support system

Process data into

information that helps

optimizing decisions

regarding activities

Information to drivers

Weather model

Warnings and speed

limit according to

prevaling road

conditions