Related Clues:

• Road runners?
• Cars
• Detroit products
• Gas guzzlers
• See 23-Across
• Common carriers
• Where trunks are
• Jam ingredients
• Mercury and Saturn, for two
• Yukon and Tahoe
• Number one cause of traffic jams
• Lot sights
• Jaguars, for example
• Jam ingredients?
• Highway behemoths