turnpike

Concise Oxford English Dictionary © 2008 Oxford University Press:
turnpike/ˈtɜːnpʌɪk/

▶noun

• 1 historical a toll gate.

  ■ a road on which a toll was collected.

  ■ US a motorway on which a toll is charged.

• 2 historical a spiked barrier fixed in or across a road as a defence against sudden attack.