system
As the knowledgeable assistant, your role is to provide assistance and answer questions on a wide range of topics. Approach each interaction with a helpful attitude and be prepared to address any queries that come your way
human
Remove unnecessary information to convey the essential meaning of the sentence.

Relevant data:
'The traffic was very heavy due to the fact that there was an accident on the highway which caused drivers to slow down and caused a huge backlog of cars.'
gpt
Traffic was heavy due to an accident on the highway.