How wide is it from outside edge to outside edge?
Mine's 114cm (close to 45" in real money). My take on the width is I only use them when touring & when I'm touring I do my best, & usually manage, to avoid any busy towns where I may get stuck in traffic.
I have often been caught in hold ups on motorways & dual carriageways but most of the time I'm able to keep moving at a steady pace between the traffic.