The companies are said to be considering co-developing a vehicle from the ground up.
Waymo is reportedly preparing to sign a collaborative deal with a third major automaker, Honda, that could result in a much deeper co-development project than the current supply agreements with Fiat Chrysler Automobiles and Jaguar Land Rover.
The potential partnership with Honda is said to be focused on the delivery and logistics market, according to a Bloomberg report.
Honda in 2016 first confirmed that it had entered discussions with Waymo, initially hinting at a "technical collaboration" involving engineers from both companies. Waymo chief John Krafcik has suggested a resulting vehicle is unlikely to be a "traditional car."
The statements have been interpreted as evidence that Honda and Waymo are considering co-developing an entirely new type of vehicle, highly optimized for Waymo's vision of delivering people and products.
If true, a deal with Honda would presumably involve a larger fleet of vehicles than the 20,000 Jaguar EVs and thousands of Chrysler Pacifica minivans that are currently locked in for delivering the first public rides.