Which equipment is more productive when assisted by a pusher tractor?

When considering productivity in the context of heavy equipment on a construction site, the scraper is particularly enhanced by the assistance of a pusher tractor. Scrapers are designed for moving large volumes of earth and can operate more efficiently when aided by a pusher tractor, which provides additional power and traction.

The pusher tractor helps by pushing the scraper forward as it fills its bowl with material, allowing for a much faster cycle time. This increased efficiency comes from the ability to maintain a higher speed while loading, which can significantly decrease the overall time required to move large quantities of dirt or aggregate. Additionally, the tractor can help in maintaining stability on uneven terrain, further facilitating productive operations.

Other equipment types, while also important on construction sites, do not benefit to the same extent from a pusher tractor. Excavators are primarily designed for digging and moving material but do not require the same pusher assistance for efficiency. Dozers primarily move material themselves without needing the extra force provided by a pusher tractor. Rollers are used for compaction, which doesn't involve the same need for assistance in moving large volumes of earth. Thus, the combination of the scraper with a pusher tractor creates a highly productive team on-site, demonstrating the rationale behind the correct choice.