In Portland we're also in the process of replacing another bridge which as a single sidewalk less than 2ft wide directly adjacent to traffic, no barriers. It's

In Portland we're also in the process of replacing another bridge which as a single sidewalk less than 2ft wide directly adjacent to traffic, no barriers. It's dangerous and awkward to try and move past another person on foot on it, and near-suicidal to try and cycle across. So I will be happy to have 4ft for biking and walking, really.