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pinch point
pinch point n.
Brit. 
/ˈpɪn(t)ʃ pɔɪnt/
, /ˈpɪn(t)ʃ pɔɪnt/U.S. /ˈpɪn(t)ʃ ˌpɔɪnt/
(a) Mathematics a point at which a surface touches itself tangentially; (b) a point of congestion, confusion, or difficulty; esp. a place on a road, street, etc., at which traffic flow is restricted, and congestion tends to build up./ˈpɪn(t)ʃ ˌpɔɪnt/ΘΚΠ
society > travel > transport > transport or conveyance in a vehicle > vehicular traffic > [noun] > traffic jam
stop1625
stoppage1727
lock1834
block1861
pinch point1868
tie-up1889
traffic jam1891
traffic snarl1899
traffic snarl1933
traffic snarl-up1947
thrombosis1959
snarl-up1960
back-up1962
tailback1975
gridlock1980
society > travel > means of travel > route or way > way, passage, or means of access to a place > [noun] > congested or difficult part
pinch1754
bottleneck1850
pinch point1868
1868 A. Cayley in Q. Jrnl. Pure & Appl. Math. 9 332 A surface having a nodal line has in general on this nodal line points where the two tangent planes coincide, or as I propose to term them ‘pinch-points’.
1961 Times 15 Aug. 10/3 No loading or unloading at all will be permitted at important intersections and other ‘pinch points’.
1965 New Society 11 Nov. 10/3 Oliver Cox considers heating one of the major ‘pinch-points’ in building today.
1992 Which? Oct. 33/2 Pinch Points... These slow traffic by interrupting flow.
1997 Proc. Amer. Math. Soc. 125 329 The obvious multiple structure defined on C, in case C is a curve of contact on F, is symmetric if SingF contains at least one pinch point.
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