There is no such thing as 'shipping lanes' on the high seas, just areas of greater or lesser traffic density.
The track from Hawaii
cuts across just so many routes. Multiply the number of ports
and Alaska by the number of ports
between Yokohama and Singapore
and that's the number of shipping lanes.
Close north of Hawaii and that northern track through the Aleutians seem to be the busy spots just now.
I use marinetraffic pre-voyage to spot where large concentrations of fishing
boats are working so I can try and avoid them (2nd pic) or at least know where I am going to encounter them. They do move around but in the short term - maybe a week or so - it seems to work
of the world 'shipping lanes' are fairly well defined ( 3rd pic). The big red smudge uper left is where there were masses of fishing
boats in 2019.
Sailing north from Antofagasta I laid a course up the coast just inside the 200 mile Peruvian economic zone and didn't see one while staying far enough offshore
to avoid any encounters with local boats..