The “lanes” along which the liners travel are fixed by agreement among the steamship companies in consultation with the Hydrographic departments of the different countries. These routes are arranged so that east-bound steamers are always a number of miles away from those going west, and thus the danger of collision between east and west-bound vessels is entirely eliminated. The “lanes” can be moved farther south if icebergs threaten, and north again when the danger is removed. Of course the farther south they are placed, the longer the journey to be made, and the longer the time spent on board, with consequent grumbling by some passengers. For example, the lanes since the disaster to the Titanic have been moved one hundred miles farther south, which means one hundred and eighty miles longer journey, taking eight hours.
The only real precaution against colliding with icebergs is to go south of the place where they are likely to be: there is no other way.