From Longman Dictionary of Contemporary Englishslip roadˈslip road noun [countable] British English TTRa road for driving onto or off a motorway SYN ramp American English
Examples from the Corpus
slip road• Here, cars are reversing back up a slip road because the way ahead is blocked.• It wants to add a northbound entry slip road and a southbound exit slip road to the junction.• Protesters also stopped traffic on a motorway slip road.• The car seemed to take ages to reach the point where the slip road entered the autobahn. 