Table 3 Setup of meteorological parameters for calculation of relative risk increase for different meteorological conditions. \(p_{a,adv}\) and \(p_{a,ref}\) is the crash probability under adverse and reference conditions, respectively. In all cases, \({\text {Yr}}=2017\), \({\text {Trf}}=1\) and \(\bar{p}_{a,d}\) is set to the median value of all districts

Winter precipitation

\(p_{a,adv}\)

\(-3^\circ\)C

1 mm/h

100%

30\(^\circ\)

10 m/s

\(p_{a,ref}\)

\(+3^\circ\)C

0 mm/h

100%

30\(^\circ\)

10 m/s

Summer precipitation

\(p_{a,adv}\)

\(15^\circ\)C

1 mm/h

100%

30\(^\circ\)

10 m/s

\(p_{a,ref}\)

\(15^\circ\)C

0 mm/h

100%

30\(^\circ\)

10 m/s

Low sun, no clouds

\(p_{a,adv}\)

\(15^\circ\)C

0 mm/h

0%

20\(^\circ\)

10 m/s

\(p_{a,ref}\)

\(15^\circ\)C

0 mm/h

100%

20\(^\circ\)

10 m/s

Extreme wind

\(p_{a,adv}\)

\(15^\circ\)C

0 mm/h

100%

30\(^\circ\)

25 m/s

\(p_{a,ref}\)

\(15^\circ\)C

0 mm/h

100%

30\(^\circ\)

5 m/s