Looking on the internet deeply has found these results:

I was stuck in a traffic jam. is the most popular phrase on the web.

I was stuck on a traffic jam. 10 results on the web	I was stuck in a traffic jam. 11,180 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
It doesn't look like this phrase is very popular! The search could not find any examples on the internet.	One time when I was stuck in a traffic jam, it turned out everyone was rubbernecking to see some fawns grazing on the side of the freeway. TwoDogsFucking 184�... billions drive cars in the world, yet few have any idea of what lies under the bonnet,"�... Nov 18, 2014 ... "I was stuck in a traffic jam when I had a curious thought Recently I was stuck in a traffic jam, a passenger in a car inching along up to my destination. I was startled by a loud honking to my right, and when I instinctively�... ... and unable to move or moving very slowly: Roadworks have caused traffic jams throughout the city centre. I was stuck in a traffic jam for an hour yesterday.

I was stuck on a traffic jam.

10 results on the web

I was stuck in a traffic jam.

11,180 results on the web

More popular!

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

One time when I was stuck in a traffic jam, it turned out everyone was rubbernecking to see some fawns grazing on the side of the freeway. TwoDogsFucking 184�...
billions drive cars in the world, yet few have any idea of what lies under the bonnet,"�...
Nov 18, 2014 ... "I was stuck in a traffic jam when I had a curious thought
Recently I was stuck in a traffic jam, a passenger in a car inching along up to my destination. I was startled by a loud honking to my right, and when I instinctively�...
... and unable to move or moving very slowly: Roadworks have caused traffic jams throughout the city centre. I was stuck in a traffic jam for an hour yesterday.