Columbia subject headings:
Roads--France--Safety measures--Congresses.
Roads--Norway--Safety measures--Congresses.
Traffic safety--France--Congresses.
Traffic safety--Norway--Congresses.
Harvard subject headings:
Roads--Safety measures--Economic aspects--France.
Roads--Safety measures--Economic aspects--Norway.
Roads--Safety measures--Economic aspects.
Princeton subject headings:
Roads--France--Safety measures--Congresses.
Roads--Norway--Safety measures--Congresses.
Traffic safety--France--Congresses.
Traffic safety--Norway--Congresses.