What does car Icons mean

[clcurry47]

On my Galaxy S8 plus, in the upper left hand corner there is a small grey car with another car directly behind it, following it. Does anyone know what it means? Thanks.

 

[SpookDroid]

Google's Driving notices. Either estimates to where you usually go to at that time of day or notices about accidents and traffic conditions while you're on the move. They also appear if you have an appointment with a set address and you're not nearby so that you know when it's the best time to leave so you get there on time.