But (usually) the hard shoulder (emergency lane) is narrower than normal lanes. Typically (here in Italy) the normal lanes are 3.25 to 3.75 meters wide while t

But (usually) the hard shoulder (emergency lane) is narrower than normal lanes. Typically (here in Italy) the normal lanes are 3.25 to 3.75 meters wide while the emergency lane is 2.50 to 3.00 (it depends on the period the highway was built, I believe) So you need to change horizontal lines/signage and make all lanes, including the hard shoulder/emergency lane, the same width, and this means that in "normal" operation travel lanes will be narrower.