rubbernecking
verb
Definitions
To watch by craning the neck (as though it were made of rubber), especially if the observer and observed are in motion relative to each other.
Example: The driver was so busy rubbernecking, trying to get a good view of the accident, that he was almost part of another accident.
noun
Definitions
The act of slowing down whilst driving a vehicle, in order to see the scene of an accident.
Generally, any act of observation in a manner considered unduly overt or otherwise unseemly.
Example: The children had never been in such a large museum and their rubbernecking was rather amusing.