Style Traffic signs show more than 9000 traffic signs of the 35 countries mentioned in [https://wiki.openstreetmap.org/wiki/Proposed_features/Extended_traffic_signs_tagging#Traffic_signs_presets this URL]. It places traffic sign on the chosen side and it shows also subkey :2 traffic signs if each traffic sign is in a different node. It is splitted in some parts. There is Traffic_signs_AME for all the American countries and Traffic_signs_EUR for the rest of the World.
You can download the betas here:
For use the beta traffic_signs style in JOSM you have to activate in Modify > Preferences > Styles and search in your pc. For use the beta traffic_signs preset in JOSM you have to activate in Modify > Preferences > Presets and search in your pc.