escape road

noun

a road, usually ending in a pile of sand, provided on a hill for a driver to drive into if his brakes fail or on a bend if he loses control of the turn

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012