Hello lanflansglka, I noticed you changed oneway=yes to oneway=no for a few roads (such as https://www.openstreetmap.org/way/189876183) using Stamen Terrain. (This map (http://maps.stamen.com/terrain/#16/20.6961/-103.4530) does not show directionality and all highways render the same even though they are dual carriage oneways). 

Many of these roads have been tagged for a long time to be oneway=yes and have reasons that they would be. The section of Highway MEX 70 that you added oneway=no tags to is a trunk dual carriageway and according to OSM Policy (https://wiki.openstreetmap.org/wiki/Dual_carriageway) each side needs to be tagged oneway=yes. Since Stamen Terrain uses OSM Data itself, it may not be useful in determining directionality. Do you agree and if so can you return these single directional lanes to oneway=yes? Thank you for your attention on this issue.