OK, we are going to make a stopped London taxi look like it's going really fast.
Start with the original
Select around your object, I also used a 5 feather, up to you.
Select the Inverse of the object. (CTRL+SHIFT+I)
Copy to a new layer.
Now on this new layer, go to filter blur motion blur. Play with the settings until you feel it looks like it's going fast enough.
Here is what I got.
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