I hear rubber-necking use dmost often in relation to traffic accidents.
Rubber-neckers are people who slow down and try to see what has happened and whether or not anyone is injured or dead.
Sample sentences:
Look! There's been a car crash over there!
Well, the police are dealing with it now, so stop rubber-necking and keep driving.
The traffic was quite slow at the scene of the accident, not because the road was blocked, but because rubber-neckers were slowing their cars to look at the scene.
Thanks
Brian
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