Collocations for barrier - noun

physical
crash, crush (BrE), flood, police, protective, safety (esp. BrE), security, ticket (BrE)
concrete
sound (figurative)
the first plane to break the sound barrier

build, erect, install
jump
break through
The crowd managed to break through the barriers.

at a/the barrier
Please show your ticket at the barrier. (BrE)

behind a/the barrier
The police waited behind the barriers.

through a/the barrier
There was a slow trickle of people through the barriers.

effective, formidable, major
class, colour/color, cultural, institutional, language, racial, trade
invisible
artificial
impenetrable, insurmountable

build, create, erect, put up, set up
The old laws created barriers to free trade.

break, break down, eliminate, lift, lower, reduce, remove
identify
cross
They believe that music can cross any barriers.

be faced with, encounter, face
overcome, transcend

barrier against
The country has set up barriers against imports.

barrier between
a class barrier between the two families

barrier to
a formidable barrier to communication

impassable, impenetrable
natural

form

barrier between
The mountains form a natural barrier between the two countries.