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A bulldozer is a construction vehicle that can use its front blade to level ground or its rear ripper to scrape earth and sand and to break up rocks. Categorized as a large bulldozer, the D155AX-6 is used in projects such as civil engineering works and quarrying sites. While a traditional bulldozer blade has a gently curved surface, the Sigma-Blade developed for this model has a profile that resembles the Greek letter sigma when viewed from above. Since it excavates from the central area of the blade, the D155AX-6 is more efficient than other bulldozers.