The Melaka Occupational Safety and Health Department (DOSH) has issued two prohibition notices to project site contractors involved in the upgrading of an existing sewer on Jalan Bukit Katil, Melaka following an accident on Thursday (Jan 5) that resulted in the death of a motorcyclist.br br In a statement on Friday (Jan 5), the department said the notices were issued due to the contractors' failure to install sturdy barriers around the excavation area and the lack of appropriate warning signs with sufficient lighting.