snarl-up noun a chaotic mess; often applied to a near-gridlock in a traffic system UK,1960
Egypt’s political snarl-up[.] — TheEconomist, 8 February 2001
My Golf surprised itself by hitting 62mph before creaking to a halt within a minute in a snarl-up near Wolverhampton North services. — TheGuardian, 9 January 2004