Remember, 'steamroller' refers to very heavy machinery in construction, not just any machine. The new road required a steamroller to even out the surface.
Pro Tip 2/3
Specific Use
'Steamroller' is specifically for road-making or flattening surfaces, not general driving or transport. The workers operated a steamroller to prepare the ground for asphalt.
Pro Tip 3/3
Past Name
Historically, 'steamrollers' were powered by steam, but nowadays, they're mostly engine-powered. Although it's called a steamroller, it actually runs on diesel.