I think these led signs done by بلدية المنطقة الخضراء وشارع المطار and not the traffic police, maybe its not official? I don’t know but I’m pretty sure the white numbers written on street pavement is correct because they require tender to do such jobs.    
And maybe the 140km/h speed limit is only for specific times? Don’t know.    
I see we stick with the 100 written on circular signs and written on pavement.     