I suppose that the signs from your picture are in the place of these ones:https://www.bing.com/maps?cp=43.680217%7E28.083935&lvl=17.0&v=2&sV=1&pi=-16.2&style=x&dir=186.8
I added a node for speed bump 50 m in SE direction (though I didn't see it on any images). This is the minimal distance between the sign and the traffic_calming required by the Bulgarian law. Please, verify! I added a speed bump and speed limit in opposite direction(as visible on images).