“Why did the boy smear peanut butter on the road?”/“To go with the traffic jam.”

A “traffic jam” isn’t made of jam, but there’s a riddle:
 
Q: Why did the boy smear peanut butter on the road?
A: To go with the traffic jam.
 
The joke was posted on the newsgroup alt.humor.puns on February 1, 2005.
   
     
Google Groups: alt.humor.puns
Kids puns of the Weak 02-01-05
Stan Kegel
2/1/05
(...)
Why did the boy smear peanut butter on the road?
To go with the traffic jam! (Sarah, 11)
 
Google Groups: alt.humor.puns
Kids Puns of the Weak 03-05-01 (This date is incorrect.—ed.)
Stan Kegel
3/1/05
(...)
Why did the boy smear peanut butter on the road?
To go with the traffic jam!  (Sarah, 11)
       
Google Books
February 2007, Boys’ Life, “Think & Grin,” pg. 53, col. 2:
Ross: Why was Pedro spreading peanut butter on the road?
Blake: Why?
Ross: To go with the traffic jam!
Ross Robinson, Coppell, Tex.
 
Twitter
Melissa & Doug
@MelissaAndDoug
Why did the boy smear peanut butter on the road? To go with the traffic jam! #kids #jokes
8:31 AM - 9 Sep 2010
   
Explain the Joke
Peanut Butter and Traffic Jam!
Posted on February 12, 2013 by stfleming
(...)
Explanation:  Peanut butter and jelly is a common type of sandwich in the United States.  Jam and jelly are synonyms (they are not identical but very much the same).  A traffic jam is when there are so many cars in one place that the cars are stopped (or moving very slowly).  This joke plays with the word jam- the kind that goes with peanut butter and the kind that stops traffic.  Ha ha ha!
 
Reddit—Jokes
Why did the man smear peanut butter on the road?
submitted November 15, 2015 by Shoewho
To go with the traffic jam.
     
Google Books
The Super, Epic, Mega Joke Book for Kids
By Whee Winn
Grand Rapids, MI: Zonderkidz
2016
Pg. ?:
Why did the girl spread peanut butter on the road?
To go with the traffic jam.
 
Reddit—Jokes
Why did the man smear peanut butter on the road?
submitted May 3, 2018 by MyJelloJiggles
To go with the traffic jam.
     
Twitter
dad jokes
@dadtellsjokes
Why do you spread Peanut Butter on the road?
To go with the Traffic Jam!
10:38 PM - 16 Jun 2018
 
Reddit—Jokes
Why did the idiot put peanut butter on the road?
submitted August 10, 2018 by Magno2394
To go with the traffic jam!