Well the other comments might be jumping to conclusions (which might have had an impact of course). But the Portuguese bridge is over a river, this one is over

Well the other comments might be jumping to conclusions (which might have had an impact of course). But the Portuguese bridge is over a river, this one is over a valley (though sure, the alps are a complication). They're also built slightly differently if you see the photos. But yeah I think it's not only due to simple reasons.