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- Organisation for Economic Co-operation and Development countries (3)
- European Conference of Ministers of Transport (2)
- Traffic safety--Europe (2)
- Transportation--Europe--Passenger traffic (2)
- Transportation--Europe--Statistics--Periodicals (2)
- 経済政策．国際経済 (2)
- Freight and freightage--Environmental aspects--Congresses (1)
- Traffic accidents--Europe--Statistics--Periodicals (1)
- Transportation and state--Europe--Periodicals (1)
- Transportation--Europe--Periodicals (1)