fatalities and accidents, reduction targets against ‘do nothing’ scenario;
route choice and traffic patterns;
possible effects on the existing networks (e.g. exits, intersections, level crossings);
road users, including vulnerable users (e.g. pedestrians, cyclists, motorcyclists);
traffic (e.g. traffic volume, traffic categorisation by type);
seasonal and climatic conditions;
presence of a sufficient number of safe parking areas;
seismic activity.