Probably The Best Traffic Jam In The World?

[mushroom25]

https://www.bbc.com/news/uk-england-northamptonshire-48402451

:-)

[aelmpvw]

wasn't the best jam created by an overturned lorry carrying a load of strawberries?

[Buenchico]

Probably not:
https://www.marketingmag.com.au/news-c/news-carlsberg-amended-slogan-not-best/

[Hopkirk]

When I saw the question title, I thought it might refer to this.

https://www.bbc.co.uk/news/world-asia-48401491

[Caran]

I remember my late husband telling me the tale of when he was evacuated as a boy up north somewhere.
A lorry overturned on a bridge over a river. It was carrying a load of bottles of whisky. All the children had a fine old time diving in the river for bottles of whisky.
Much to the delight of their parents.

[mushroom25]

//When I saw the question title, I thought it might refer to this. //

um,no. anything that plays its part - howsoever small - in the deaths of 10 climbers (correct at time of writing) this year isn't likely to earn that epithet.