Related Clues:

• Some jams are made of these
• Race and pace
• What lots have lots of
• Rush hour accumulation
• Train components
• Dodgem units
• They're kept in a lot
• Pullman and dining, for two
• Gridlock elements
• They need their bearings
• Convertibles, e.g.
• Common conveyances
• Parts of a train
• Idlers in a jam
• Coupes and convertibles