How to use jam in a sentence?

(1) They detoured around the traffic jam by heading south. (2) He spread some strawberry jam on his toast. (3) Heat the jam until it liquefies. (4) He ate a whole pot of jam.

• Tube lines heading east are jam-packed with people taking wildly circuitous routes to work.
• When the place was jam-packed it was a fantastic place.
• The swishing is held in one large room which is jam-packed full of clothes and accessories up for grabs.