Main road and Turnpike

Main road noun - A major road for any form of motor transport.

Turnpike and main road are semantically related in highway topic. In some cases you can use "Turnpike" instead a noun phrase "Main road", when it comes to topics like freeway.

Turnpike noun - A passage cleared for public vehicular travel.

Main road and turnpike are semantically related in highway topic. You can use "Main road" instead a noun "Turnpike", if it concerns topics such as freeway.