What does a no right turn sign plus a yellow truck sign mean?

Small trucks are prohibited from making right turns

It means that within a limited range, all vehicles are prohibited from parking temporarily or for a long time. Set up in areas where parking of vehicles is prohibited; 2. The sign is a red circle with a red slash on a blue background. Temporary parking is unrestricted. The time, type and range of vehicles that are prohibited from parking can be explained with auxiliary signs; 3. Prohibition signs are one of the main signs in traffic signs, signs that prohibit or restrict vehicles, such as no passing, no parking, no left turning, no Honking, speed limits, weight limits, etc.