Are New Zealand fences mostly impassable or not?

Hello everyone, Me and my wife going to visit New Zealand in summer... oh, I mean in winter, of course. :) It may be not a particularly good choice of time for the tramping, but it is what we have. We are planning to spend a 1-2 weeks in July walking about North Island, and 1-2 weeks in early October walking about South Island. We did some research, categorized the routes and tracks, made some maps etc., but one question still bothers us. Please take a look at this map in process I've made from LINZ Topo50 (excellent!) sources - http://habreffect.ru/files/cc8/af68a419e/abel-harwoods.jpg Red lines are foot tracks, fuchsia lines are fences, black are roads. There is an Inland Track branching out from Abel Tasman coastal track, ending at the Pages Saddle, and connected to the Harwoods Hole track by a small road. However I can clearly see the road between Mount Evans and the Harwoods Hole passes a few fences and may prove to be closed. From your experience, are these fences impassable? I don't mean these particular fences, just majority of the fences on the LINZ maps. Maybe this is a private property? Or just the sheep fence? Oh. Unfortunately private borders are not plotted on the LINZ maps, so we have to guess. Sticking to the known tracks seems to be the better solution to avoid fences. However they are not always connected, there wouldnt be any buses in winter, and we both do not drive, so walking between tracks is the only option. Would appreciate your knowledge of the fences and avoiding accidental trespassing. Thanks a lot :)