This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. A barricade or obstruction across a road set up to prevent the escape or passage, as of a fugitive or enemy troops.

n. An obstruction in a road, as fallen rocks or trees.

n. Something, such as a situation or condition, that prevents further progress toward an accomplishment.

n. Something that blocks or obstructs a road.

n. An obstacle or impediment.

v. To prevent, hinder.

n. any condition that makes it difficult to make progress or to achieve an objective

n. a barrier set up by police to stop traffic on a street or road in order to catch a fugitive or inspect traffic etc.

"Funnel enough money to Amtrak to repair the out-of-service cars (the main roadblock to increasing service right now)."

roadblocks   

barrier   

hindrance    hinder   

checkpoint    hurdle    impediment    foul-up    setback    milestone    barricade