Guardrail pile drivers are specialized hydraulic machines used to quickly and precisely drive steel or wooden posts for highway safety barriers, often installing posts in as little as 15–20 seconds per unit. These self-propelled crawler or truck-mounted rigs offer high vertical stability, often including GPS for perfect alignment, with some models installing up to 250 meters of barrier in a day. 

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This video explains how a diesel pile hammer works:

When selecting a pile driver, consider the required driving force, pile diameter, maximum driving depth, and the terrain of the project site.