Excuse me if I don't understand the situation entirely, but I think the problem is the actual access restriction or enforcement of it is different from a literal reading of the signs. This must be the case if the signs don't give adequate information to completely describe the restriction. In that case, do your best to determine the actual restriction as it is enforced and map accordingly.
Access restriction tags on nodes should work fine for routers, but remember if the node is an intersection, the access tags apply to all movement through the intersection, and you probably want to avoid that. Also, such restrictions are less commonly visible on rendered maps; for this reason I prefer to put access tags on ways if reality can be accurately modelled that way. On the other hand, if the restriction exists at a point not at an intersection and only for one direction of travel, I would have to split the way there and make a no_straight_on turn restriction relation with except= or for= tagging to indicate what vehicles are or are not prohibited. Also, if a road does not permit passage of vehicles unless it's the only choice (such as going to or from that road or a side street with no other outlet) then remember access=destination (or hgv=destination, or whatever else might apply) is something we can do.
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