Related Clues:

• Wheels
• Products of some plants
• Hyper, impatient ones
• Mercury and Saturn, e.g.
• Elephant groups
• Grazing groups
• They get into jams
• Gridlock components
• Freeway fillers
• Road runners
• Large quantities
• Lemons or cream puffs
• Driven ones
• Sedans, e.g.
• They get people into jams