motorway       
noun [ C ] UK uk/ˈməʊ.tə.weɪ/ us/ˈmoʊ.t̬ɚ.weɪ/
A2 高速公路
a wide road for fast-moving traffic, especially in the UK, Ireland, and some other countries, with a limited number of places at which drivers can enter and leave it
  Because of the bad weather, motorway (driving) conditions are expected to be hazardous tonight. 由于天气恶劣,今晚在高速公路驾车可能会很危险。 
 Compare: expresswayfreewaysuperhighway pike (ROAD) turnpike 
 - More examples
 - There has been a collision on the southbound stretch of the motorway.
 - Environment protesters have made common cause with local people to stop the motorway being built.
 - Soon after we joined the motorway, the car started to make a strange noise.
 - A contraflow is in operation between junctions 13 and 14 on the motorway.
 - I got cut up several times on the motorway this morning - I've never seen such dangerous driving!
 - Double glazing has helped to deaden the noise from the motorway.