Hi gurglypipe, Thank you for your patience.

I have made the edit using Bing Aerial Imagery where lane markings are indicative of travel directions. Then I have verified with TomTom proprietary sources showing the traffic flow in that segment is mostly consistent with the one-way tag.

However, your suggestion also makes sense in terms of practicality and accessibility. There is minimal movement at that section in the opposite direction and it may be because that might be a lesser-preferred section by the customers. 

I have made the corrections according to your suggestions. But I think additional ground truth is required to confirm this situation confidently.