Can a semi-trailer cross EU member state borders without special permits?

A semi-trailer that meets EU Directive 96/53/EC dimension and weight limits circulates freely across EU member state borders for international commercial freight without additional permits. Combinations above standard limits — including oversized cargo on low-loader or flatbed semi-trailers — require special transport authorisation from each country's road authority before departure, and some oversize routes require escort vehicles under national regulations.

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What Is a Semi-Trailer?