What does +100% xxxxxxxxxxx Zone adjacency bonuses mean?

[Dojaeni]

Say i am playing japan where you get +1 to each zone adjacent your industrial zone.

My industrial zone is in between a commercial and and holy site (gets +2)

if i take the craftsman policy with +100% Industrial Zone adjacency bonuses does that mean that my industrial zone gets double ie goes to 4 or that my comercial and holy site go from +1 to +2?

[tempest.of.emptiness]

That policy will double (+100%) the adjacency bonus of your industrial zones. So the +2 bonus will become +4. The bonus that your industrial zone provides to other sectors for being adjacent to it will not be affected.

[Dojaeni]

Thanks tempest