divided highway

US /dɪˌvaɪdɪd ˈhaɪweɪ/
UK /dɪˌvaɪdɪd ˈhaɪweɪ/
"divided highway" picture
1.

a highway with a median strip or barrier separating traffic flowing in opposite directions

:
The new divided highway has significantly reduced accidents.
Driving on a divided highway is generally safer than on a two-lane road.