Research and analysis
Longer semi-trailer trial evaluation: annual report 2021
Summary of research and findings from year 9 of the longer semi-trailer (LST) trial evaluation.
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The Department for Transport began a trial of longer semi-trailers (LSTs) for articulated goods vehicles in January 2012 on roads in Great Britain.
The trial aims to see if using longer semi-trailers achieves the anticipated environmental and economic benefits while assessing their impact on road safety.