20 to 25 mm

50 to 75 mm

75 to 100 mm

100 to 120 mm

mastic asphalt

sheet asphalt

bituminous carpet

bituminous concrete

sides towards the centre

centre towards the sides

lower edge towards the upper edge

upper edge towards the lower edge

2%

2.50%

3%

4%

20 kmph

30 kmph

40 kmph

50 kmph