This proposal aims to make extendible trailers conform to all lateral protection requirements for trailers regardless of length, in
order to remove the safety risk to vulnerable road users when the trailer is in the fully extended position. This is achieved by the removal of section 13.1.1. and 16.1.1 that specify some exemptions to requirements when the trailer is extended.

To improve the effectiveness of LPDs in preventing left- or right-turn collisions, Japan intends to submit the following proposals:
1. Eliminating the exemption for semi-trailer tractors
2. Reducing the lower edge ground clearance of LPDs
3. Clarifying the upper edge structure of LPDs
4. Adding exemption to ensure BSIS requirements