Viaduct
Viaduct: a bridge structure designed for allowing transportation vehicles over an area while leaving free space under the span structures
Source: "SP 46.13330.2012. Code of Regulations. Bridges and Culverts. Updated Edition of SNiP 3.06.04-91"
(approved by Order of the Ministry of Regional Development of Russia dated 29.12.2011 No. 635)
Viaduct: an artificial road structure serving for allowing transportation vehicles or pedestrians over the ground surface
Source: "ODM 218.2.012-2011. Sectoral Road Methodological Document. Classification of Constructive Elements of Artificial Road Structures"
(adopted and entered into force by the order of Rosavtodor dated September 13, 2011, No. 731-r)