[jimrandomh]

People are more comfortable with data collection when they understand what the data will be used for and agree that the use is valuable to society. If the use is unclear or doesn't seem important, then people worry that the real reason is something creepy that's been left unsaid.

In this case, people mostly agree that R&D in self-driving cars is important, and can clearly see how this data helps with that. Whereas identifying traffic in Google Maps/Apple Maps feels less important, and the connection between location tracking and detecting traffic takes a little more work to understand.