Level 0

Level 1

Level 2

No effect

Road width <1 M

0 to 1 floor

A few specific user

1 - 2 M road width

1 to 3 floor

A few unspecified users

2 - 6 M road width

4 to 6 floor

Level 3

Level 4

Many specific users

6 - 12 M road width

7 to 9 floor

Many unspecified users

Road width > 12 M

10 floors or more