Answer:

pileup

Answer	Crossword Clue
PILEUP	Accumulate
PILEUP	Traffic stopper
PILEUP	Rubbernecking cause

PILEUP	Traffic snarler
PILEUP	Amass
PILEUP	Traffic jam.
PILEUP	Road accident
PILEUP	Traffic tragedy
PILEUP	Multicar accident
PILEUP	Awful accident
PILEUP	Multi-vehicle crash

PILEUP	Interstate calamity
PILEUP	Road mishap
PILEUP	Multicar crash
PILEUP	Jam producer

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.