Some contractors told CNA prices have surged by as much as 60 per cent in recent months, while supply shortages have forced firms to delay projects by up to a few months.  SINGAPORE: Some road construction companies are facing mounting delays and rising costs as global supply disruptions tighten access to bitumen – a key material used in paving roads and airport runways. Some contractors told CNA prices have surged by as much as 60 per cent in recent months, while supply shortages have forced