> advantages that others don't: nonconductive material, heavier weight against winds, etc. There are other large US cities with wind, one is even known as the

> advantages that others don't: nonconductive material, heavier weight against winds, etc. There are other large US cities with wind, one is even known as the "Windy City" (although it isn't the windiest). All of them need nonconductive and heat resistant. So, what makes SF's ladder needs unique?