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Your demand is a very common one, usually called Time Series data modeling.

1. It is not recommended to divide collections into different collections by day/car;

2. If you have a particularly large number of documents, you can consider Sharding.

Because you reveal less information, if you get the car’s position every minute, you might as well try the following method:

{ plate : String,
  brand : String,
  color :  String,
  timestamp_hour : ISODate,
  track : [{0 : [Longitude, latitude]},
           {1 : [xxx, xxx]}
           ...
           {59 : [xxx, xxx]}]
 }

The general idea is to try to make one document contain as much information as possible to improve query efficiency.

For reference.

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You need to consider the specific business scenario, how to display the data, and the display dimensions.