Division 1.1.2 The following parameters shall be taken into account:X1

tunnel length,

number of tubes,

number of lanes,

cross-sectional geometry,

vertical and horizontal alignment,

type of construction,

uni-directional or bi-directional traffic,

traffic volume per tube (including its time distribution),

risk of congestion (daily or seasonal),

access time for the emergency services,

presence and percentage of heavy goods vehicles,

presence, percentage and type of dangerous goods traffic,

characteristics of the access roads,

lane width,

speed considerations,

geographical and meteorological environment.