Hana sends Tayo on an errand to a construction site. There, Tayo meets heavy machinery and gets excited, making the vehicles bicker about who is cooler. They decide to hold a contest to settle the matter, with Tayo as their judge. However, Tayo gives them weird quizzes and embarrassing assignments to carry out.
The last assignment, knocking down barrels with tires, leads to havoc when the atmosphere becomes overheated and the construction walls get knocked down, creating a mess on the nearby roads. The vehicles quickly act together to restore things as they were. Everyone realizes that heavy machinery is coolest when cooperating with each other.