Proposal to amend the requirements for the visible volume to the front of the vehicle (relative to the distance between the A-pillars or Inter A-Pillar Distance (IAPD)), to clarify that high capacity vehicles and vehicles with competing objectives do not have to meet the requirement for the Subsection Frontal Visible Volume (SFVV), and to describe how the SFVV should be calculated to take account of the reduced volume for vehicles with narrower cab designs.