Streamlining can help cars travel faster. The more streamlined the car is the less drag it creates, so the faster it can travel with ease.
When a car is aerodynamic it finds a path through the particles so the car can easily pass through them.
The same concept applies for this drop of water:
This image shows how the particles pass over the car:
I hope this is what you wanted as I had a similar question for my science homework the other day.
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