roadblock

[rohd-blok]
noun
1.
an obstruction placed across a road, especially of barricades or police cars, for halting or hindering traffic, as to facilitate the capture of a pursued car or inspection for safety violations.
2.
an obstruction on a road, as a fallen tree or a pile of fallen rocks.
3.
a hastily built barricade, as of barbed wire, erected across a road to hold up the advance of an enemy.
4.
an action, condition, etc., that obstructs progress toward an objective: Nationalism is a roadblock to European unity.
verb (used with object)
5.
to halt or obstruct with or as if with a roadblock.

Origin:
1935–40; road + block

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
roadblock (ˈrəʊdˌblɒk)
 
n
1.  a barrier set up across a road by the police or military, in order to stop a fugitive, inspect traffic, etc
2.  a difficulty or obstacle to progress

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
They will not have found a clear answer: such polls may be a landmark on the
  road to peace or a roadblock.
To capture this growth, technology and the corresponding information overload
  is both a roadblock and enabler.
But this means that the fiscal roadblock to higher growth will remain.
Anything that can be construed as a roadblock to more reactor construction will
  be used as such by many, if given the opportunity.
Synonyms
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