Once again, the open world has changed since Cars Mater-National (2007). All of the changes brought in, including the Ornament Valley Airport, Fillmore's Nature Park and the Upper Mine, have been removed, but some new changes came as well, which include a road running through the field in Ornament Valley, a new section tunnel in the Abandoned Mine in Tailfin Pass and the gates to Sarge's Boot Camp being open. Besides that, the 3 parts of Radiator Springs are now 1 world with no loading required to switch between any of the 2. Players can also explore 4 new locations outside of Radiator Springs, which are Radiator Springs Speedway, Santa Carburera, Autovia, and Motoropolis City.
The characters engine noises are different in Relay Races in comparison to other modes. This was also present in Cars Mater-National (2007).