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slip road
slip road n.
Brit. 
/ˈslɪp rəʊd/
, /ˈslɪp rəʊd/U.S. /ˈslɪp ˌroʊd/
a short (usually one-way) road giving access to or exit from a main highway, esp. a motorway; an approach road./ˈslɪp ˌroʊd/ΘΠ
society > travel > means of travel > route or way > way, path, or track > road > [noun] > for wheeled vehicles > for fast motor traffic > slip road
ramp1925
off-ramp1939
slip road1953
on-ramp1956
1953 Times 11 Feb. 3/3 A ‘slip-road’ a mile and a half long..would draw away from the narrow streets of High Barnet the great number of heavy lorries now passing through this congested centre.
1968 W. Garner Deep, Deep Freeze iii. 36 He took the slip road on to the Autobahn.
1979 A. Price Tomorrow's Ghost ii. 17 He waited to leave the slip~road for the motorway proper.
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