The IDEF0 model of the proposed decision support system (DSS) is given Figure 1. To create a risk map of the area, main inputs are the topographic map, site layout plan and the major obstacles identified in the project’s construction site such as, other pipelines, power lines. These maps and obstacle information will be integrated to determine potential hazards and health and safety risks according to the H&S regulations and the project specifications. The final outputs of the system are the risk map that highlights the risk factors and their ratings and proposed mitigation measures to be taken at those high-risk locations (Atay et al. 2010).