You are driving an articulated vehicle of gross vehicle weight rating of 24 tones. Is parking your vehicle on the road beyond this sign only allowed in specially designated parking lots?

The visible D-42 "built-up area" sign informs of entry into an area where special regulations apply. In accordance with the Road Traffic Act, in a built-up area, parking a vehicle with a maximum authorised mass exceeding 16 tonnes is only permitted in designated places. The vehicle you are driving exceeds this mass, therefore this rule applies.