Related Clues:

• They get people into jams
• Auto options
• They create carbon monoxide
• Family cars
• Train set
• Lot fillers
• Sonatas, e.g.
• They're sold in lots
• Latter-day chariots
• Engine and caboose, e.g.
• 2006 Pixar film
• Road sights
• Gridlock ingredients
• Certain models
• Ends of 20- and 57-Across and 11- and 34-Down