Possible Clues:

• Drive-in movie unit
• Family of five, say
• Full group in a sedan
• Half the rally place advert for passengers
• In Italy, Charles heads commercial crowd coming along for the ride
• Caught a lad or criminal -- that's what you get in an estate, say
• Bunch of clowns in a circus stunt, say
• Vehicle capacity causes state highway to switch sides
• Large lot
• Family of five, e.g.